Kaito Tenjou in the manga and Japanese version, is the son of Dr. Faker, a Number Hunter, and one of the main characters who was gathering "Numbers" for his father in order to help his formerly sick brother, Haruto Tenjo, in Yu-Gi-Oh! ZEXAL. Assisted by a robot named Orbital 7, Kaito was the most direct adversary of the first three arcs, but his "Numbers" are now in the possession of Yuma Tsukumo and Astral.
When Haruto was cured, he became friends with Yuma and Astral and cooperated with them in the Interdimensional War between the Astral World and Barian World, becoming directly involved with the Legend of the Dragons of Light and Time. After defeating Mizael on the Moon, Kaito deems Mizael the true Dragon Tamer and entrusts him to complete his quest after succumbing to the vacuum of space. He was later revived by the power of the Numeron Code after Yuma's and Astral's final Duel.
An alternate universe version of Kaito is set to appear in Yu-Gi-Oh! ARC-V.