Astral

Astral is a key character from Yu-Gi-Oh! ZEXAL. He is a mysterious energy being from the Astral World who becomes the deuteragonist and partner of Yuma Tsukumo.

He appears as a transparent, ethereal figure with a blue body, green markings, blue gems, heterochromic eyes (one gold, one white), and blue mohawk-like hair. Initially, he suffers from amnesia after arriving in the human world—his memories scattered into 100 "Number" cards. Only Yuma (and certain others tied to the Astral or Barian Worlds) can see or hear him.

Astral is calm, highly intelligent, analytical, and a dueling prodigy who provides strategic advice during Duels. He gradually learns about human emotions, friendship, and "kattobingu" (Yuma's hot-blooded style) through their partnership, evolving from detached observer to a true friend. His goal revolves around collecting the "Numbers" to recover his memories and fulfill his original mission.