Gar is a mumbled Shadow Vault quest-giver NPC who resembles a Pygmy Chanter. You can only activate him and his quests after you defeat Ordrak in Torchlight.
Gar stands outside the Shadow Vault adjacent to Valeria in the town (past the bridge, across the river). Most of his quests require the player to defeat a champion level monster on a certain floor and/or retrieve a certain item. Gar will reward you with Gold, Fame, XP and an enchanted item.
Gar seems to either talk in a garbled way or in another language. Only the required details of his quests are understood and highlighted in yellow.