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.
In 5e: Simon the Devious and the Leather Skins (from What We Do In The Shadows) as a Dhampir Hexblade Warlock with Pact of the Chain.
Between the chain familiar (Count Rapula), a zombie from Undying Servitude (Ken the Accountant), Summon Undead (Blagvlad the Exsanguinator, or Desdemona the Shrieker, or Impussa) and an Accursed Specter (Carol), you have a 4-person posse by level 6. It grows situationally or permanently when you gain access to Danse Macabre, Create Undead, and Finger of Death.
Mechanically, you’re done by 13, and can either finish off with Bard (probably Whispers) or Paladin (Oathbreaker). Either way, take Inspiring Leader once you’ve maxed Cha, and then go get yourself that cursed witch’s hat!