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.
Grum is half orc. Not sure what other half. Grum is fearsome warrior. He yell, enemy run.
Grum has axe. Is favorite axe. Grum had dream once about axe. Asked for piece of Grum’s shoe. Promise axe. Grum accept trade. Now Grum have axe.
People say Grum do scary magic. Silly people. Grum is warrior, not know magic. Grum just have axe, and yell loud. Sometimes yell so loud enemy explode. Silly enemy.
What would that be mechanically? Warlock?
Yep, hexblade. A warlock who doesn’t know he’s a warlock. Spellcasting is just yelling loudly, and I’d choose spells that could be explained as him just being really scary.