I’ll go first.
A person seeks out a fey to get a warlock pact. The person doesn’t know, however, that they’re a sorcerer with strong fey ancestry that just hasn’t manifested yet. The fey obviously agrees to the “pact” and makes a ridiculous contract that the person agrees to. The person lives their entire life believing they’re a warlock when they’re actually a sorcerer. The only thing the fey did was help the person’s magicky shit manifest.
It’s kind of simple, but I always wanted to play a rogue with proficiency in perform that declares he’s a bard. I had a friend who played a typical rogue, and would try to skim a bit off the top whenever the party would get money. The other people in the party would catch him since he was a thief and they were always watching him. So, I figured declaring yourself a thief is kinda dumb. So, I’d be a rogue with absolutely no magic power pretending to buff people, and taking credit when things worked out ince my music must have helped.
Yoink, your idea is now mine. I’m totally gonna try to play a character like this at somepoint