Berserk Button: If you say, for example "Undertale's the best game ever and all other games should die", I'd probably be annoyed and share my opinion, which is "Undertale's a good game. Did it deserve GOTY? I guess. Is it the best game ever? It's all up to opinion." If you retort with something like "(Synonym for "Make Love") OFF, (bundle of sticks)! You don't know anything about life or games!" after that, I'd probably go Super Sonic on your (synonym for Donkey).
Gratuitous Japanese: Granted, I learned it from Vocaloid and Anime, but the pros outweigh the cons, right? I also have to stumble through it.
Evil Twin//Evil Knockoff: I did this in Miitomo with me. (For those wondering, My mii is the original, and I'm making a mii that's the evil version of me.)