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@Dera_Lufe this is all subjective anyway, i think the colors can look great sometimes but other times the rainbow tires my eyes out (for example, this shou art).
@Dera_Lufe it always has been there, i think this first image is what they were using to promote the game for global, and the rainbow actually works here. 2nd and 3rd were available since the start. 4th is a new version of reimu, based on her EOSD design.