Orin "Blackfoot" was a prisoner in the Iron Stocks who was freed by Grog. As an NPC, Orin was played by Matthew Mercer.
"In the Belly of the Beast" (1x54)
Orin was freed from his imprisonment by Grog.
When Orin tried to steal Vox Machina's treasure left as bait for Umbrasyl, Pike's bomb killed him.