And then you've got Wyll, the Blade of Wilderness, who can only be... a Pact of the Chain warlock.
I know that's because Pact of the Blade isn't in the game yet, but it just seems a bit silly.
Pact of the Blade isn't proficient in martial weapons like Rapiers, yet that's what he uses. Intriguingly, a Hexblade IS proficient in martial weapons.