The Lone Wolf....and we still refer to the player as such, though we haven’t gamed with him for a decade:
His characters weren’t totally identical - some were rogues, some rangers, some half-elves, some human - but all wore grey cloaks, carried longsword and dagger, were born in tragedy, had no relatives and friends...and all were Lone Wolves!
They would always leave the party after scouting ahead, always attack NPCs ( great for plot devices...not!), never share treasure and rarely speak.
They were like a bad fantasy version of Eastwood’s Man With No Name.
Totally adversarial, but we laugh about it now, especially in his final game with us; I was running 2E Return to the Tomb of Horrors, and his character, whose name escapes me so we’ll call him Lone Wolf, went off ahead to scout near the City of Moil, and Lone Wolf-ed his way into a Winter Wight. He could have fled, could have called for help, but, no, Lone Wolf attacked. It was messy.