Garlen. We'd take over DA WORLD!...Then he'd turn me into a gear.
I'd have to say...maybe Klonoa. I'd probably choose Guntz, but chances are, that'd backfire. Horribly.
I would probably ask him a few things (what were his feelings about the endings of his games? How does he feel about Lolo? What are his opinions on Pac-man, and how he feels about Pac-man being in the game? What's his favorite color? How does he power the wind ring in the games that have neither Hewpoe or Lolo helping him (Moonlight Mansion, Dream Champ Tournament, Beach Volleyball)?
Honestly, there's not much else you could do with a videogame character in the real world...I guess we could play volleyball, or eat cheeseburgers, or something else...