Curate, connect, and discover
Ah yes. Mikey. So here we go:
I headcanon that Mikey's electric powers still reside deep inside. But Mikey can't control them at all, and they're dormant. He occasionally gets slightly electrocuted, but as time goes on it weakens and happens less and less.
Of course he has lightning scars!! I mean. He did get electrocuted quite a lot in the episode. Mikey got used to being shocked but his brothers, well.. they had a hard time getting used to it, cuz it was out of nowhere. Mikey learns to feel the shock charging as time goes on.
I didn't say as much as I said about Donnie but oh well..