Mine is the Imperius Curse. I'd use it on people--not for evil purpose (e.g. murder, political corruption, theft, etc.) but for my own personal advantage--typically my parents, to make them be a bit nicer to me and give in more, buying me more things I want.
Maybe cunfundo could also work for that, idk
Fiendfyre. I absolutely love fire and it could be useful for both attacking and defending in combat or for providing heat or smoke signals. Yes, it’s technically dark, but that just means it’s stronger than normal fire (and is more easily abused).
Mwhahahaha! /j
Mine would be accio. I would love to be able to get things that are slightly out of my reach without getting up.
Id never lose any of my things again... at least not for long, cuz id just accio them back to meeee! XD
Id use either accio or scourgify mostly, but in a duel, perhaps expelliarmus!
