Astral

Astral is a mysterious entity in Yu-Gi-Oh! ZEXAL. It is said that his memories have scattered, becoming the 99 "Numbers Cards", so his purpose is a complete mystery.

Biography
A new legend began when Astral appeared before Yuma Tsukumo and Ryoga Kamishiro. She comes from a different dimension, somehow she ended up in Yuma's dimension. She lost her memories, but all she remembers is that she looked for a talented duelist.

Kotori considered that she is a ghost. Right when Yuma is about to give up hope against Shark, Astral appears and says to Yuma "Stand up and win!".