Punchy

Originally called the "Bearbot 2010", Punchy was designed to fend off a theiving bear named Gumbo, but he would later gain sentience and become a good friend to Luka. He gets badly injured or otherwise harmed in every story except for the first one (my personal favorite instance is him getting shot with a shotgun and having to be emergency transferred into a peach tin with legs stuck on). Poor guy!