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* Astral's observations stopped after their Duel with [[Kaito Tenjo|Kaito]] which left him quiet and depressed. However, after their Duel with [[Jin]], which restored his and Yuma's confidence, his observations returned.
*Astral's eyes have a similar color scheme to Dartz's eyes while possessed by the Orichalcos Stone. The left eye has a yellow/gold hue, and the right bears a blueish eye.
*Astral may be a reference of Sai from the "Hikaru no Go" manga series. They are both referred to as "ghost" or "spirit" and help a first weak but potentially powerful protagonist in their respective games (Go or Yu-Gi-Oh). Astral and Sai also share an initially rocky relationship with the host, although Yuma more openly opposes Astral than Hikaru does to Sai when in a game.
==References==
