The Number Guardians, known as the Numbers Guardians (ナンバーズのガーディアン Nanbāzu no Gādian) in the Japanese version, are the spirits of the "Mythyrian Number" cards in the Number ruins in the Yu-Gi-Oh! ZEXAL anime. They are assigned with the duty of protecting these "Number" cards.
In order for a Duelist to obtain the Mythyrian Number card, they must Duel against the card's guardian to determine if they are worthy of wielding it. After a guardian is defeated, they usually disappear. They are also related to the Legendary Figures or the cards themselves.
|Identity||Associated Mythyrian Figures||Guarding Number|
|Mach||Dumon||Number 44: Sky Pegasus|
|Battle Ox||Vector||Number 65: Djinn Buster|
|Number 54's guardian||Alito||Number 54: Lion Heart|
|Jinlon||Mizar||Number 46: Dragluon|
|Ponta||Girag||Number 64: Ronin Raccoon Sandayu|
|Abyss||Nash and Marin||Number 73: Abyss Splash and Number 94: Crystalzero|
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