Number C

"Number C", known as "Chaos Numbers" ( Kaosu Nanbāzu) in the OCG, is a sub-archetype to both the "Chaos" archetype and the "Number" archetype. They are used by Yuma Tsukumo, Reginald Kastle, Misael, Gilag, Alit, Durbe, Vector, and Number 96: Dark Mist in the Yu-Gi-Oh! ZEXAL anime and Yu-Gi-Oh! D Team ZEXAL manga and are supported by "Rank-Up-Magic Barian's Force", "Rank-Up-Magic Limited Barian's Force" and "Rank-Up-Magic Numeron Force".

They are are upgraded versions of the base "Number", which are Summoned by overlaying their base counterpart through Chaos Xyz Evolution.

So far, all "Chaos Numbers", if they are Summoned normally rather than by Chaos Xyz Evolution, require one more material than their normal versions and require the materials to be the same corresponding Attribute.

In the anime, the player must have 1000 or less Life Points to Summon "Number C39: Utopia Ray" and "Number C32: Shark Drake Veiss" while in the OCG/TCG, you must have the aforementioned amount of Life Points to activate their effects. When Summoned with 1000 or less Life Points, they keep the same ATK and DEF. They are Summoned by reverting to their sealed form and entering the Overlay Network. The Overlay Network then explodes, showing the new sealed form, which then unfolds into the monster.

The distinct difference in appearance between the "Number C" Summoned by normal means and one Summoned with a "Rank-Up-Magic" card, is that parts of the latter's body has a blood-red, energy-like design.

"Number C" monsters have powerful effects, though this is balanced out by their requirements - needing 1000 or less life points for the "Number C" monsters that have the same Rank as their "Number" counterparts, or requiring specific monsters to be attached to them as Xyz Material for Ranked-Up Number C monsters.

When Number holders have a high level of a certain emotion, Chaos Numbers start to appear. For example, Astral and Yuma obtained "Number C39: Utopia Ray" after Astral was happy to know Yuma considered him a friend. Reginald Kastle also obtained "Number C32: Shark Drake Veiss" after his desire for revenge, brought on by "Number 32: Shark Drake", overpowered him. Later, Yuma Tsukumo obtained "Number C39: Utopia Ray V" after Vector (as Rei Shingetsu) gave Yuma "Rank-Up-Magic Limited Barian's Force" and their "friendship" was strengthened as a result, though this was used by Vector to get closer to Yuma.

When a Barian summons a Chaos Number through the use of "Rank-Up", the user must make a contract with it in order to maintain control at the risk of it depleting his life, such as with Gilag when he summoned his powerful "Number C106: Giant Hand Red". It can also put the user at risk in case that the Chaos Number ever gets destroyed, which can leave him severely injured and even to the brink of death.