Who would you say: who are the champions, who firstly seem to be harmless, but in reality they can be very dangerous? (According to lore.)

I just started to watch Arcane again, and read some lore too, and this question almost immediately came to my mind. Some champions seem to be very kind, almost innocent, and so far away from being dangerous, like they wouldn't be capable to fight. (I know not all champs have violent acts, and past, or even killed anybody.) Just sometimes while reading their stories, it is easy to forget, how some of them can cause a huge mess easily.