I usually play him as I imagine a slow 3-year-old would behave in the body of Mr. Universe. Kindly, naiive, pouty when tired, often hungry, and easily delighted, but also prone to violent, house-levelling tantrums.
I think that will be as important as my Charater Sheet with my Next Charater.... this could be fun
However this dose remind me of an Ettin that my Players Befrended Nambed Dumb-Gurm (one head named dumb-other named Grum however he dosn't know witch head is witch)