I voted for Atmey, who is easily one of the more memorable one-off characters.
I agree that PW1 Larry is the best. 3-2 Larry is pretty bad and a lot of that is Phoenix's writing. Every Larry afterwards is good. 3-5 and E2-3 Larry just has a different dynamic with Edgeworth as the protagonist, which makes sense to me. I have no memory of 6-6 Larry, but he was fine.
One thing I like about Larry is that he's actually a decent artist and his art gets better in every game.
SSBM_Guy
"[Freud] started his scientific career by trying to explain the sexuality of a fish. And he failed."