@Eksentrysyti I think her name being Tirano and everyone calling her a Tyrannosaurus and such is the author making one of their "on-the-nose" jokes, like with everyone else in Shouko's school has a gimmick based on their name or personality
Also about "engrish"
As a person who's first language is Russian I really wanted to shoot myself while trying to understand what Rei says, I REALLY WANTED TO