Card Trivia:Firewall Dragon


 * This monster is the cover card for Code of the Duelist.


 * This monster is a signature card of Yusaku Fujiki.
 * It shares the same ATK of 2500 as of the other signature cards: "Dark Magician", "Elemental HERO Neos", "Stardust Dragon", "Number 39: Utopia" and "Odd-Eyes Pendulum Dragon". These monsters are respectively the signature cards of Yugi Muto, Jaden Yuki, Yusei Fudo, Yuma Tsukumo and Yuya Sakaki, the previous protagonists from the first five series of the anime
 * As a Link Monster, it is the first signature card of a main protagonist to not possess either a Level/Rank or a DEF.
 * As a Link-4 monster, it is the first protagonist monster that cannot be summoned with 2 "sacrifices".
 * The first time this card's summoned, however, is with 2 Link-3 monsters (one of which used its Link Rating and the other was only used as 1 material). The second and third time it was summoned also involved two monsters: one Link-3 Monster ("Encode Talker", who was one of the two Link-3 monsters used in the first summoning) and one non-Link Monster.
 * This monster is named after a firewall, a network security system in computing that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.
 * Therefore, this card can represent Yusaku's actions as Playmaker against the Knights of Hanoi: Protecting the Virtual World against any threat that menaces it.


 * This card was the first Link-4 monster to be released.


 * This card has 2 downgraded Link-2 counterparts: "Proxy Dragon" and "Security Dragon".
 * Their combined ATK, Link Ratings, and Link Arrows equal those of this card's.
 * Their effects are also very similar, with the effect of "Proxy Dragon" involving cards it points to being destroyed (though in this case it is a cost rather than a trigger), and the effect of "Security Dragon" returning cards to the hand once while its on the field if it is co-linked.


 * This monster and "Decode Talker" are the first ace monsters of a spin-off protagonist whose Type is neither Dragon nor Warrior, thus breaking the pattern of the spin-off protagonists' ace monsters (though "Firewall Dragon" does resemble a Dragon and "Decode Talker" does resemble a Warrior, so they only break the pattern semantically).
 * It is also the first time a protagonist uses a newly created Type (in this case, Cyberse).
 * This card eventually replacing the 2300 ATK "Decode Talker" as Yusaku's ace monster mirrors both Jaden Yuki's "Elemental HERO Neos", who eventually replaced the 2100 ATK "Elemental HERO Flame Wingman", and Yusei Fudo's "Stardust Dragon", who eventually replaced the 2300 ATK "Junk Warrior".
 * Therefore the thematics of "Firewall Dragon" which, focus on recovery and Summoning back monsters to strengthen the field by its presence, can be similar to the effect of "Stardust Dragon" to protect the field from any harmful effect by its presence and Summoning itself back to strengthen the field.
 * Those similarities are also applied to their rival monsters "Topologic Bomber Dragon" and "Red Dragon Archfiend", which are their complete foils and focus mainly to the destruction of the field to reign supreme by itself, as well as being the same Type.
 * This card also opposes "Borreload Dragon", as both monsters feature opposing stances and color schemes similar to "Stardust Dragon" and "Red Dragon Archfiend." Furthermore, their effects also oppose each other, as "Firewall" willingly protects other monsters, while "Borreload" forcefully controls other monsters before sending them to the Graveyard.


 * This monster's first artwork features a pose similar to the artwork of "Stardust Dragon", while its second artwork is the form it "transitions" into in order to attack.


 * This card is the first monster cover card not to appear in the anime before the next booster pack cover card monster.


 * This monster's attack name, "Tempest Attack", is likely named after Transient Electromagnetic Pulse Emanation Standard (TEMPEST) Attacks, which work on the principle of intercepting electromagnetic radiation emissions from electronic devices such as monitors, hard disk and PC memory from a remote location, and allow the replay of the information captured.


 * This is the first signature card of a main protagonist to be on the Forbidden/Limited Lists; it is currently Limited in both TCG and OCG.
 * It is also the first Link Monster, as well as the first Cyberse monster, to be Limited as well as be on the Lists.


 * However, despite this monster is the signature card of Yusaku Fujiki, it has been summoned the least amount of times. Whereas most main protagonists signature monsters have appeared relatively often in most future duels they're owners are involved in, Yusaku has been an outlier in this regard, using it in only a few times in the anime.


 * This card is the second non-"Code Talker" monster Yusaku gained from a Data Storm via his Skill, Storm Access, after "Link Bumper".
 * It is also currently the only Link-4 monster he obtained with this method, and the only one he's been shown to possess.