sly_(hollow_knight)
Sly is a shopkeeper NPC in Hollow Knight who sells the Knight (hollow knight) a number of wares, such as Charms, Mask Shards and Vessel Fragments. As the Great Nailsage, he trained the Nailmasters Oro (hollow knight), Mato (hollow knight) and Sheo (hollow knight); in this persona he wears a red cloak and wields a greatnail (hollow knight).