Purple carries royal connotations with it, especially when it comes to character design in Dragon Ball. Purple isn't a color Akira Toriyama often uses, but when he does, it carries a lot of power behind it. Demon King Piccolo famously wore Piccolo when he reigned as Dragon Ball's first true supervillain. Purple is Frieza's defining color in Dragon Ball Z, even incorporating it into his Black Frieza form in the Dragon Ball Super manga.
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