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When Shinichiro gets dark impulses he gets the little swirly things in his eyes as but when Mikey gets his dark impulses his eyes turned white like how he was when he was sick and not able to move so I'm thinking every time his dark impulse shows that's OG Mikey taking control and having freedom of himself but because in the OG timeline he couldn't do anything he took control of Mikey's body when his dark impulses showed but I'm really starting to think the OG Mikey lives inside of Mikey and he's always been there but I think he's the actual dark impulses and if he is then the reason he's so violent it's because he went insane not being able to move or talk for all that time and he had a slow antagonizing death so it would kinda make sense for him to be that violent. Also if Mikey or Shinichiro are in dark impulse mode for too long then their eyes stay black but you can tell by their expressions that they are in dark impulse mode.