Chills

Kaio is an underground gang member and friend of Rikuo in Yu-Gi-Oh! ZEXAL. He is one of the "Numbers" holders, wielding "Freezerdon".

Personality
Kaio is shown to be a typical gang member, being overly rude and cruel even to members of his gang. He shows an immense level of loyalty to his partner, Rikuo (calling him "Nii-chan", meaning "brother"), and bases his Deck around defending Rikuo in a Duel.

Biography
Their gang took in Ryoga Kamishiro after he quit Dueling. Rikuo and Kaio later learned of a rare deck being put on display in a museum, featuring "Chaos End Ruler -Ruler of the Beginning and the End-", and set out to steal it with Ryoga in tow. Another gang member informed Yuma of their attempt, allowing Yuma challenged them both to a Duel. Ryoga teamed up with Yuma, making it a 2-on-2 Tag-Team Duel. During the Duel, Ryoga correctly guessed that he and Rikuo cheated by turning off their D-Pad's shuffling function and placing their cards in a set order so that they know which cards they and their partner would draw. After he and Rikuo lost the two thugs ran away from Ryoga in fear, having lost the influence of the "Numbers" cards.

Deck
Kaio's Deck is constructed with Ice-themed Dinosaur cards. Kaio's monsters are all WATER-Attribute with ice and blizzard theme, focusing on defensive and Summoning Level 5 monsters to work in Tag-Team Duels with Rikuo in order to Xyz Summon his ace monster, "Number 19: Freezerdon". All of his Dinosaur monsters have the "-don" suffix while Rikuo's Dinosaurs have the "-saurus" suffix. His Deck is designed to support and defend Rikuo, featuring cards that negate and redirect attacks, allowing Rikuo to continue his offensive strategy.