>>24671694Mecha originated from shows that prominently feature something mechanical, technological. But over time the definition of "mechanical" stretched. Like, Evangelion is technically a mecha anime, but robots aren't even mechanical and it's a show about mental problems, not cool robot fights.
I'm simplifying it a lot, but mecha as a genre is about a clueless protagonist who's been granted power(giant robot/exoskeleton/henshin suit) and caught in an ever-escalating international conflict he had nothing to do with, feat. love triangles and tragic deaths.