Slugfest isn't so bright. Scratch that—he's a complete and utter dimwit. Not only that, he's a complete and utter dimwit who's so paranoid about what others think of him that the smallest whiff of a supposed slight against his person will send him into a berserker destructive rage. Hope he never reads this.
Very often the source of the supposed "insults" is whatever message he's carrying in his function as a data courier. Berserker destructive rages aren't very good for recorded data, and often result in their destruction.
His alt-mode is a Stegosaurus/Microcassette.