Astral is a mysterious entity from the 'Yu-Gi-Oh! ZEXAL' series, originating from a parallel dimension known as the Astral World. He is a key character who partners with the protagonist, Yuma Tsukumo, to recover the 100 'Number' cards, which are fragments of Astral's own lost memories. Throughout the series, Astral provides guidance and support to Yuma, helping him grow as a duelist and a person. Despite his initial lack of understanding about human emotions, Astral gradually learns about friendship, trust, and courage from his experiences with Yuma.