kaiten
A tiny rat-like creature that will fight you for no good reason. It also does stupid tricks and thinks it's the boss of you.
“It just bit my finger for no reason.”
“Of course it did. That’s what Kaitens do.”
“It stood on its hands again.”
“Why does it keep doing that?”
“Because it thinks it’s cool.”
“It did a trick and looked at me like I was stupid.”
“Yep. That’s a Kaiten.”