grimm (hollow knight)

An NPC/boss in Hollow Knight, and a central character in the Grimm Troupe expansion/questline. He is a bat or moth-like entity in a black cloak who leads the titular circus to Dirtmouth when summoned by the Knight.
Depending on the Knight's actions he can either be reborn through the Grimmchild or slain for good after the Troupe is banished.