Jakob

Jacob, known as Jose in the Japanese version, is the primary antagonist of the World Racing Grand Prix in Yu-Gi-Oh! 5D's. As the leader of the Three Emperors of Yliaster, his master plan is to erase one of what Yliaster believes to be one of history's greatest mistakes: Ener-D. The attempt is ties to completing what the three emperors refer to as the Infinity Circuit.

Likewise his comrades and Bruno, Jacob is also a left-handed duelist.

Design
Jacob is the largest member both in height and mass of the three emperors. Although no official height has been given, Jacob is over seven feet tall, and has massive arms, as seen when Sherry was able to wrap her entire body around one of his arms. As the oldest Emperor of Yliaster, Jacob has wrinkled skin, most notably under his eyes, and a long, father-time style gray beard that reaches all the way down to his waist. In addition to the beard, Jacob has an overgrown right eyebrow that covers his right eye, and his left eye is yellow. Other than the beard and the eyebrow, Jacob does not have any other hair on his head.

Like the other emperors, Jacob primarily wears white, has a white cloak and hood, and a red gem on his head. Unlike the other emperors though, Jacob's gem is above his right eye instead of between his eyes. He also has a gray patch with an Infinity symbol on his face, but unlike Lester and Primo, Jacob's patch covers his nose and mouth similar to a gas mask, which muffles his voice.

Jacob's color variation other than the white is a dark golden orange, as seen on his pants, front, and the shoulder pads that pin his cloak. Jacob wears black gloves, metal arm bands and black boots. His pants, which are the golden orange and white, are loose around his feet, and underneath Jacob wears black boots. The white cloak that Jakob wears covers a white armor shell over his chest, back, and shoulders, which on the front bears an infinity symbol similar to that of the Machine Emperors. However, rather than a glowing green core, Jacob's symbol is shut. Directly underneath the symbol on the chest, Jacob's abdomen unfolds to reveal a duel disk is built onto him.

Personality
Jacob acts as the group's superior and is the wisest of the trio. He moves slowly and methodically, planning each move carefully, and holding a great deal of patience to both complete his plan, and dealing with obstacles in his path. Especially when it comes to Primo, who has not always been in agreement with Jacob and has attempted to thwart Jacob's plans so that he can go forward with his own. Jacob though is not all calm, showing great distaste for humanity as he sees them as arrogant, shortsighted, and in constant need of Yliaster's help to stay on God's path to avoid destruction. He holds a cold attitude towards those he's harmed, such as Sherry LeBlanc, justifying her parents murder and his lacking memory of why Yliaster did it as just another correction in history.

Jacob reflects on himself through observing his own teammates, thinking back to when he was younger while watching Lester duel Luna and Leo, and how he outgrew Primo's brash arrogance when planning the Diablo Riding Roid Army.

During his duel with Jack, Jacob showed a great amount of ruthlessness when he activated Speed Spell - Take Over and grabbed hold of Jack's Duel Runner and then pushed Jack, and Jack's Duel Runner, away after explaining the Speed Spell's effect.

The Initial Appearance
Jacob first appeared alongside Primo and Lester when Primo acquired his Machine Emperor Wisel Infinity. Jacob noted that they did not have to do anything for the tablet to arrive on its own, and pondered on whether that means that all the tablets will just show up on their own. When Security arrived to investigate the site, he recognized Lazar, and comments that they were suppose to meet Lazar earlier, but he they had stood him up to come and retrieve the tablet. Jacob stood quietly as Primo and Lester explained to Lazar who they were and that they were the new directors to replace Rex Goodwin.

Jacob reappeared behind the scenes again during the WRGP opening party, where he, Primo and Lester all watched the dinner from a back room. Lazar came in from giving his opening speech, and Jacob complimented him on a job well done. Lester is amused by the fact no one at the party knows how they're being used, but Primo pointed out that this effort seems to be a waste, suggesting that they force the fight with their own strength. Jacob though objects because they do not have enough strength to complete their task themselves, and the WRGP would draw all those who have the power to do what he intends to do, which angered Primo. Just as their discussion was ending, Dobocle, a Turbo Duelist who doesn't like Turbo Duels being showcased as little games of entertainment crashes the party. Lazar is shocked to see this, as Jacob is disgruntled to see the party crasher, but also is annoyed by how amused Primo is by the intruder. When Akiza Izinski uses her psychic powers to thwart Dobocle's rampage in the party, Jacob noted her psychic abilities. Then Primo, annoyed that Security couldn't actually catch the intruder, goes out on his Terrible Omen and crashed Dobocle by using Wisel, alerting everyone to a reappearance of Ghost.

Jacob, still watching from the couch in the room, continued watching as Primo returns because Yusei Fudo engaged an unknown duelist in a Turbo Duel. However, no one sees the mysterious duelist perform his Accel Synchro Summon because the process jammed the feed. This initially led Primo to ignore the duel as a waste of time, but Jacob did not agree because the duel completed one of the circuits in the Infinity Circuit, which also perked Primo's interest to pursue the mysterious duelist on his own in which finding out what happens in a Accel Synchro Summon that makes it so powerful. No one still knows to this day.

Lester's Test
Later, prior to Lester's tablet arriving, Jacob, along with Lester and Primo watched Yusei and Akiza's Turbo Duel from their true base of operations. Lester is bored because the duel was not producing circuits for the Infinity Circuit. Jacob realizes that it was not producing enough power but had faith that his plan would ultimately succeed through the WRGP. His musing though are cut off when Primo makes a point that the Crimson Dragon could still be a potential threat to the master plan, just as it was the end to Rex Goodwin's plan. Primo proposes that he should defeat Yusei in a duel and take Stardust Dragon to effectively cut off the Crimson Dragon's head. Lester finds the idea hilarious because Primo had already lost to Yusei once as Ghost, but the discussion was cut off by the arrival of Lester's tablet. Jakob never commented on the issue.

Jacob though stayed behind the scenes for Lester's plot to duel Luna, leaving the undercover work to Lester and Primo, who disguised himself as well because he wanted to see the Signer power as well. After Lester revealed himself, Jakob and Primo watched Lester's from their thrones when he challenged Luna and Leo to a Turbo Duel at the same time. Once Lester Summoned Machine Emperor Skiel Infinity, Jacob and Primo had a brief conversation where Primo commented that Lester is getting ahead of himself, but Jacob responded that children are just that way, adding that he remembers when he acted like that during his childhood. They continue watching intently, paying extra attention when Luna summoned Ancient Fairy Dragon, and Lester absorbed it with Skiel's effect. They see Leo take back Ancient Fairy Dragon from Skiel with Power Break, and then both are surprised when the Crimson Dragon saves Leo's life when Lester counterattacked and defeated Leo with Skiel Attack 5, and the duel monster spirits save Luna when Lester countered Luna with Infinity Force before defeating her as well. Following the duel, Yliaster erased Lester's presence as a transfer student from history, removed the mansion he used as well as any memory of him except from the Signers, who would later be revealed to be immune from Yliaster's ability to change history.

Creation of the Diablo
A rebellious Primo though soon took matters into his own hands. Defecting from Jacob's plan, Primo built the Diablo Riding Roid Army and used Lazar to steal a D-Wheel program that Yusei Fudo and Bruno had worked together on. Jakob confronted Primo by contacting him at the factory where he was completing the robots, asking him what he was doing, but Primo answered that he was carrying out his own plan. Jacob protested that his plan will be ruined if Primo carried on like this, but Primo responded that he could care less about Jacob's plan and would do as he wished, and then cut the transmission before Jacob could say anything else.

Jacob, fuming from the blatant disrespect, wondered what on earth Primo is thinking, and Lester commented that Primo was just immature, adding that Jacob was once like that as well. Jacob though argued that he outgrew and forgot Primo's sort of attitude a long time ago. Lester then deduced to Jacob that Primo isn't interested in Jacob using the Signers to complete the Circuit, he wanted to force it with his own strength. Jacob realizes that is the purpose the Riding Roids would fulfill, but asked how did Primo know that the Signers were working on the program that Lazar stole. Lester didn't know but he taunted Jacob by asking if he's now interested in Primo's plan, but then argues that it doesn't matter. Primo was not wasting time, and the three of them had the same goal of activating the Circuit. However, Lester pointed out that there wasn't a need to follow the same plan. Jacob though objected that it is a waste of time to change their plans when they're so close to completing them. Lester though brushed it off that it's still just a matter of preference. Lester got excited because he realized that when the Circuit worked out, he would end up just like Primo and Jacob, and he didn't ever want to get that old. Jacob though just called Lester an impudent little brat. Following the argument though, Primo made his most deliberate attempt to ruin Jacob's plan by attempting to kill three of the Signers (Yusei, Jack Atlas, and Crow Hogan) by blowing up the factory where he had just finished producing the Riding Roid Army. They all manage to escape before it's destruction, along with Lazar and Bruno.

Orchestrating Impostor Jack Atlas
Shortly after Primo brought his Riding Roid Army online, Jacob attempted to show Primo that the original plan was not flawed. Jakob and his companions orchestrated the appearance of an imposter of Jack Atlas to gauge the power of the Crimson Dragon in an attempt to activate more of the Infinity Circuit. The initial appearance of Impostor Jack frames the real Jack Atlas for crashing Turbo Duelists. Yliaster then broke Jack out of his cell, knowing that he would attempt to clear his name and proceeded to set up a duel between him and his impostor. The impostor won the duel and sent Jack into the ocean. However, instead of letting him die, Jacob ordered Jack be brought to a cave where he was forced to watch his impostor go around ruining his name. The three emperors watched as Primo asked Jacob why they couldn't get rid of Jack because he had already lost to his impostor once. Jacob answered that his connection to the Crimson Dragon could become a problem, and they couldn't risk it interfering. Lester just commented to them them the Crimson Dragon was their problem because he had enough trouble forging Jack's deck. Jack broke free from his virtual cell, which was in a cave along with his Duel Runner, and chased down his impostor.

The two Jacks dueled once more, and this time Jack defeated his impostor's three Red Dragon Archfiends with Trust Guardian and Majestic Red Dragon, which disintegrated the impostor Jack, a robot. After the explosion, the impostor's deck evaporated. Lester and Primo were upset at the loss, calling it a waste of time, but when the duel activated another circuit on the Infinity Circuit, Jacob was pleased. Following the duel though, Yliaster once again removed the cave where Jack was held captive, removing all traces of their involvement with them, and left the Signers feeling like there was a much bigger force manipulating the situation.

The WRGP Commences
Following Yusei's return from Crashtown, Sherry LeBlanc and her butler and friend Elsworth attacked Sector Security building to force an evacuation. When the building was locked down after the evacuation, it came to the Three Emperor's attention of what was happening, which amused to Lester since as the directors of Sector Security, it was their job to do something about it. Primo blamed Lazar because he had abandoned his post after almost being killed in the factory that Primo blew up, but Jacob told Primo to leave Lazar alone because he was of no interest, and to ignore the situation at Sector Security because they were too busy deal with such a trivial matter. Unbeknownst to Jakob or the other emperors though, Sherry, Bruno, and Yusei met ZONE for the first time that day through Sherry's Z-One card.

The Three Emperors briefly appeared on the opening day of the WRGP, where Lester commented that they'll see if Jacob's plan is truly worthwhile, and they proceed to watch the rest of the first round matches, including Team 5Ds match against Team Unicorn. The first round of the WRGP completed more circuits in the Infinity Circuit. As they continued to watch the Infinity Circuit's progress through more Turbo Duels, Lester admired how it was progressively completing itself, and Jakob explained that the participants' Duelist power was going to change the future.

Things have started stirring up again during the second round of the preliminaries, as Primo had already launched a second plan of his own to try to take out the Signers. Primo had approached Team Catastrophe and given them Cards of Darkness, namely Hidden Knight -Hook-, who were using it to crash Turbo Duelists, including Crow, Akiza, Andore, and Jean. Jacob never caught onto this plan, but Lester figured out Primo was up to something when he went to watch Team 5D's take on Team Catastrophe in person. When Team Catastrophe lost to Team 5D's without eliminating Team 5D's from the tournament, Primo decided to put his plan into full motion and unleash the Riding Roid Army, regardless of what the status of Jakob's plan was.

The Divine Battle over New Domino City
Jacob did not immediately find out that Primo had made his move. Instead, Lester, who figured it out after Primo left Team Catastrophe's match suddenly, teleported back to their base of operation where Jacob was continuing to monitor the Circuit. Jacob was then pestered by Lester, who pointed out that relying on the Turbo Duels to produce the Infinity Circuit was sure taking a long time as the Circuit formed bit by bit. Jacob played along, answering that they need the power of Ener-D, and therefore Turbo Duelists, to complete the Circuit. The result would make would reveal God's location, bringing his Shrine to New Domino City. Lester pointed out the Infinity Circuit was just so huge. Big enough to cover New Domino, so its completion would destroy New Domino City when the castle arrived. But Jacob responded out that was a trivial sacrifice to save the future. But then Primo's Riding Roid Army, which was attacking the WRGP, started appearing on the monitors and surprised Jacob. Lester declared in a grand gesture that those were Primo's Riding Roids. Jacob realized those were the ones that Primo built, but still wonders what's going on. Lester continued that Primo ran out of patience and is finally took matters into his own hands, unleashing his troops. Laughing, Lester said this was getting interesting. Jacob was not amused, and cursed under his breath at Primo.

So Jacob contacted Primo directly through his eyepatch. Primo, who was already angry that Yusei was turning the tide of the invasion of the Ghosts towards the humans favor, told Jacob to go away. Jacob demanded to know what Primo thought he is doing. Primo retorted to Jacob that his way was weak and explained that by forcing everyone to duel, the Circuit would surface in no time at all. Jacob tried to explain to Primo that he didn't understand because forcing the fight would not bring out a person's inner potential. Jacob said that a true Circuit wouldn't ever be completed that way. Lester though butted in, taunting Primo that he might as well listen to Jacob since Yusei Fudo was already causing Primo trouble, adding that Primo had already lost to Yusei once. This enraged Primo. Jacob tried to continue to reason with Primo, but Primo cut the transmission.

Jacob continued watching with Lester, and was alarmed when a tablet crashed outside of New Domino City, but it was not his. It was Yusei's! Jacob realized this meant that Yusei has made contact with God as well, which angered Lester because he did not want to accept any possibility that Yusei could be like them. Yusei got the monster from the tablet, and after a brief conversation with ZONE, returned to New Domino to try and stop Primo. When Yusei caught up to Primo, Jacob contacted Primo to warn him that Yusei possessed a new power. Primo was apprehensive at first, but then Lester explained that Yusei had received a tablet from God. Jacob told Primo to return because there was no guarantee that he could win. Primo was enraged at the idea that Jacob believed that he might lose, cut the connection, and combined with his Terrible Omen to fight Yusei.

Jacob watched the duel between Primo with Lester on their thrones. Lester at first kept objecting to the idea that Yusei could possible have gotten a tablet from God because tablets were suppose to just be entrusted to them in order to restore history to its proper path, but Jacob tells Lester to be quiet and watch when he realized that God willed this fight. Jacob and Lester continued watching Yusei and Primo duel until Yusei is able to achieve Clear Mind and summon the card from his tablet: Shooting Star Dragon. Lester asked Jacob what they should do. Jacob realized Yusei's monster as the card from the tablet and that the fate assigned by God was starting to escape their grasp. He wondered if the power of humans was coming before them, and cautioned that they needed to be even more careful now. Before Primo lost though, Lester noted that Primo's duel completed a large area of the Circuit. Jacob though explained that the Circuit wouldn't be complete from this one duel, and that they would need more Signer power to complete it.

Jacob Reveals Himself
Primo then lost to Yusei's Shooting Star Dragon, and is torn apart from the resulting attacks. Yusei tried to approach Primo to check on him, but Jacob used telekinesis to lift all of Primo's remains off of the highway and bring them to him and Lester, who were both atop the monument in the middle of Highway commemorating the unification of New Domino and Satellite. Jacob told Yusei to not worry about Primo because receiving the loser's sympathy would damage his pride. As Lester took possession of Primo's sword, Yusei recognizes him from his duel with Leo and Luna, and Lester explained he was just testing them, but Primo went through the whole trouble of creating the Diablo Riding Roid Army to just have it end in failure. Lester then took back his cards from Primo, along with his entire deck as Jack, Crow, and the mysterious duelist arrived at the monument as well.

With everyone on site, Jacob addressed Yusei, Crow, and Jack. He began by explaining the importance of the monument as the symbol of the unification of Satellite and New Domino City, and appreciated the irony that they all met right there. Crow asked if that means they were responsible for the Ghost attacks, and Jack demanded to know who they are. Jacob obliged to tell them their names and introduced himself, Primo, and Lester to the Signers as the Three Emperors of Yliaster. Jacob introduced himself as the leader, to which Lester objected, but Jacob gave Lester an angered look, which quickly got Lester to introduce himself as the sub-leader and Primo as the number one junior lackey.

Yusei asked them why they were making a commotion in New Domino, to which Lester said they owe them no explanation, but Jacob decided to tell them because there was nothing they could do to stop it even if they know. Jacob explained that there goal was to change the future. Jack objected to the notion, saying they decide there own future. Lester though told Jack that if he was doing such a fine job, then they wouldn't have to come out. Crow asked if they already know the future, to which Lester taunts them by asking them if they'd like to know, and then added that the future they were trying to create would not just be their own. Jack cursed at Lester, but Jacob interjected, agreeing with Lester, explaining that Yliaster is an organization crafted by their God whose job is to set the course of history back on track. Yusei's stunned, but Jacob explains that their organization has been around since prehistoric times and reached all across Earth. He added that no matter how humanity tried to change the future, they couldn't grasp the whole picture.

Crow was in disbelief because there's no way every important person could be in Yliaster's pocket, and Jacob agreed with him because the power of the world was instead set up like a food chain or a pyramid, and all Yliaster wanted control from the people from the top of that pyramid. In exchange for providing those at the top with benefits, Yliaster was allowed to guide history.

Sherry and Elsworth then arrive at the monument, and Sherry demanded to know if they were responsible for her parents death. Jacob though blew the question off, saying that he can't be bothered with remembering everyone that has faded away as a result of correcting history. Sherry then declared she would make him remember. Riding up the curve of the monument, Sherry launched her Duel Runner so that it was angled to land on Jacob. Aiming to crush Jacob, Sherry declared that now is the time for revenge, but Jacob just commented that it was useless. He caught her Duel Runner with one hand, told her that her immature antics wouldn't work, and threw the duel runner off off the monument and into the ocean, almost taking Sherry with it. Elsworth came up the other side, and while Lester deflects his attack with Primo's sword, Jacob destroyed Elsworth's Duel Runner with a back-handed punch.

Jacob continued, using the attack to explain that humans are full of stupidity and arrogance, calling the human imagination and repeated collapse the cause of history's negative change. He explained that from the shadows, the strength of Yliaster has always been involved to put humanity on the path of righteousness whenever humanity chose the path of foolishness. He then explained that no matter how they try to modify history, there was an unavoidable future coming. He addressed Yusei, telling him that when his father Dr. Fudo created Ener-D, he created an immeasurable mistake in history. Yliaster tried to use Roman Goodwin to make Ener-D disappear through Zero Reverse, but it failed. So now Yliaster is making a new revision to history to overcome the situation. Jacob explained that they were going to erase all of New Domino City. Jack, Crow, and Yusei are in disbelief, but Lester told them that they're welcome to believe what they want to believe, and tells Yusei his curse hasn't ended yet.

Sherry though told Yliaster that she wouldn't let them do that and charged at Jacob once again. Jacob though dodged her attack, punched her with a left cross, and grabbed her by her collar. Jacob told Sherry that to challenge an emperor like this made her a disgrace to real duelists. Sherry, though ripped her collar, freed from Jacob's grasp and wrapped around his left arm, telling him that she was taking his arm with him as she tried to break it off. Jacob just wondered if there was any end to the foolishness and lifted Sherry over his head with just that arm. He told her to join her parents and threw her off of the monument. Elsworth jumped off the monument after her and used a parachute in his Duel Disk so that they could land. Yusei then asked Lester and Jacob what they meant by erasing New Domino City, but Jacob told them they must come to the WRGP in order to find out, adding that they would be participating in the main round. Jack was stunned, but Jacob responded by telling them that the WRGP would answer everything.

Another meteor fell from outer space as Jacob realized that his tablet has finally arrived. Jack was confused, but Lester pointed straight up. Jack, Crow, and Yusei tried to run, but they realized it's too late to go anywhere. Jacob stopped the tablet with his telekinesis, and Yusei recognizes the tablet as one like the one that had Shooting Star Dragon. Jacob extracted the monster from it, and the tablet shattered. A duel disk unfolded from Jacob's stomach, and he put the five cards on there to summon Machine Emperor Grannel Infinity. Jacob tells Team 5D's that if they wanted the truth then they needed to keep winning the WRGP. He lifted Primo with his telekinesis and told Lester that they were leaving. Lester wondered if there was still any use for Primo, made a portal with his sword, and they left with Jacob bidding Team 5D's farewell. Once they left, power was restored to the city from when Primo attacked, and Grannel faded away.

A New History
Jacob left Team 5D's alone, letting them do as they want. However, he was later contacted by Clark Smith, the President of one of Yliaster's shell company's: Momentum Express Development Organization. Clark explained that Yusei Fudo, Sherry LeBlanc, and a third guy infiltrated his company to steal information on Yliaster, so he had disposed of them by firing them into an unstable wormhole using the Infinity Device. Jacob was not happy and decided that Momentum Express was no longer a needed organization. Clark begged for his life, but before Jacob could erase him from history, Primo returned to his throne and said that it is already done, telling Clark that he no longer exists.

The ensuing change in history caused a white shockwave to spread across the world, one which Team 5D's, Lazar, Bruno, and Elsworth were protected from because of the Crimson Dragon, and Team Ragnarok was protected from because of their Polar Gods. The result was that Momentum Express was erased from existence, and Sherry LeBlanc was kicked from the WRGP and replaced with Yliaster's new team: Team New World. As a result of entering the WRGP as Team New World, the Three Emperors of Yliaster forfeited the knowledge that they had ever taken the position as Directors of Sector Security. A loophole that Lazar took advantage of to fill the seat himself..

As Team New World, Jacob and the other Emperors swept their quarter-finals match and were projected to be the finalist of their bracket. They watched intently as the other matches produce more circuits in the Circuit, including the match where Team Taiyo summoned Sleeping Giant Thud against Team 5D's. The resulting matched provide enough Circuits for the Spiral building to appear in the sky over New Domino.

The following day, Team New World won their second match with ease, securing their position as a World Racing Grand Prix finalist. To pass the time, they watched their opponent's match: Team Five D's versus Team Ragnarok. They were observing the duel, and Lester was finding amusement out of Dragan putting Jack Atlas into a tight situation, but the emperors were astounded when Jack summoned Red Nova Dragon because it was a card that none of them recognized.

WRGP Final Match
After Primo lost to Jack, Jacob took over and started running on the duel lane to later merge with his Duel Runner. He also made it so that real damage would be felt in the duel. When the duel resumed, he quickly summoned "Grand Core" and used "Bomb Blast" (left over by Primo) to destroy it to summon "Machine Emperor Grannel Infinity". Next, he then destroyed "Infinite Spirit Machine" and use its counters to increase his life points, strengthening Grannel's attack to 12,000. Using his Machine Emperor's effects he defeated Jack and stole Red Nova Dragon, increasing its attack points to 15,500. His second opponent was Crow. Jacob beat him quite easily. After Crow's plan - to summon "Blackwing - Aurora the Northern Lights" and use its effect - failed, he used the stolen "Red Nova Dragon" to deplete Crow's LP. The turn after, he defeated Crow thanks to "Red Nova Dragon" and "Machine Emperor Grannel Infinity". However, Crow realised he couldn't win, so he gave all he had in order to Synchro Summon his "Black-Winged Dragon", leaving it for Yusei. With that, Yusei became Jacob's next opponent.

The duel progresses, Yusei gaining the upper hand summoning "Stardust Dragon" with the help of Crow's cards. Jacob then shows Yusei the future, the chaos brought upon by Synchro Monsters, summoning thousands of Machine Emperors destroying various cities. Jacob was a frail, elderly survivor who made his way to New Domino City, saddened by the destruction wrought upon the world. After seeing the future Yusei cannot believe the future he had seen and continues dueling him, summoning Shooting Star Dragon, destroying Grannel successfully. But soon afterwards he along with Primo and Lester combine into Aporia, ready to duel Yusei.

Power
As the leader of the Three Emperors of Yliaster, Jacob has immense power, but it is difficult to gauge because he mostly works behind the scenes. His largest demonstration of his power was seen in episode 110, when he uses telekinesis to move Primo and stop his stone tablet, as well as possessing superhuman strength, as seen when he easily defeated Sherry in a fight using only one arm at a time, and threw her motorcycle into the ocean and destroyed Elsworth's. His Duel Disk unfolds from the hidden compartment built into his abdomen (which was also shown in Episode 110, when he reveals Machine Emperor Grannel Infinity by activating his Duel Coat). Something that Jacob also did was run as fast as the Duel Runner, yet it could be seen that he had combustion coming out of his feet, maybe to speed himself as he ran. Just Like Lester and Primo he is able to inflict real damage when he duels.

Like Primo, Jacob also has the ability to fuse with his Duel Runner, which is similar to Grannel Carrier. With Jacob fused with his runner, the two are similar to Machine Emperor Grannel Infinity, when it is fully assembled.

Anime
Jacob plays an Infinity Deck revolving around his Machine Emperor Grannel Infinity using multiple monster pieces. His Machine Emperor is the largest of the first three. It is shown that Grannel can upgrade just like the other two can, but to what extent is unknown.