Yuuma Tsukumo

Name: 九十九 遊馬 (つくも ゆうま) Age: 13 Height: 158cm | 5ft 2in Personality: Hasty, energetic, cheerful, honest, stubborn Biography: Yuuma is striving to be a Duel Champion despite not being very good at the game. Suddenly, Astral comes into his life and gives him strategies to win, and over time Yuuma finally learns to hold his own - but not before realizing Astral got him wrapped up in something really big.

Astral

Name: アストラル Age: ? Height: 165cm | 5ft 5in Personality: Calm, assured, naive, stoic, intelligent Biography: Astral is an amnesiac alien from an alternate dimension. He was sent to Earth through an item called the King's Key to find help to save his world, which is currently being destroyed by the residents of the Barian World. His goal is to find the 99 "Numbers" cards, each of which is imbued with pieces of his memory.

ZEXAL

Name: ゼアル Age: ? Height: 165cm | 5ft 5in Personality: Serious, focused Biography: ZEXAL is the overlay of two souls - Yuuma and Astral. Throughout the story, ZEXAL acquires two upgrades and a corrupted form.

Ryouga Kamishiro | "Shark"

Name: 神代 凌牙 (かみしろ　りょうが) | シャーク Age: 14 Height: 164cm | 5ft 4in Personality: Stoic, aloof, insensitive Biography: Shark is initially no more than the school bully, but after making friends with Yuuma he sees the error of his ways and chooses to fight for his own justice.

Kaito Tenjou

Name: 天城 カイト (てんじょう　かいと) Age: 18 Height: 167cm | 5ft 6in Personality: Serious, focused, cruel Biography: Kaito is known to many as the elusive Numbers Hunter - a young man who will stop at nothing to hunt the Numbers cards, even though his method steals the owners' souls in the process.