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.
Cracks fingers
There’s the Aarakocra fighter who’s a Canadian goose with the personality of a goose with a stereotypical New Yorker. Will fight anyone at anytime over anything.
There’s the Reborn Warlock (Undead) and Wizard (Necromancy) who’s grosetque and cast’s the most vile and evil spells and doesn’t see it. They are a children’s edutainer and will constantly break the fourth fall. They are a lawful good.
A half-orc Monk (Way of Shadow/Long Death) and Warlock (Great Old One) that either is insane or actually hears the great old one. Mechanically, I do tarot card readings to determine their actions. The last time I played them, I somehow started a terrorist organization and got the poor artificer involved as my bomb maker. This character is a true chaotic alignment as never have idea what will happen.