AD&D - New World
a doppleganger who lives in the Haunted Halls
Ko often takes the form of a statue, living in what he calls “murder alley.” He haunts the Halls near Grudgewood, picking off the kobolds (and perhaps the adventurers) who are searching the dungeon for treasure. After being bested by them in battle, Ko asks to join the Revengers as friends. They accept him, despite being worried about his aggressive attitude toward “taking what he deserves”, perhaps seeing him as a weapon they could use against the kobold guards stalking the Halls.
Ko fled from the heroes after they killed 15 kobolds with a combination of two spells, setting the aflame in a terrible conflagration of flesh and steel.