It's to early now, but I'd like to see it gradually become Sackboy. There's incredible potential there for a massive variety of games in the same vein as Mario.
Plus, the character itself is so customizeable. In the same vein as Microsoft's Avatars, it'd be cool if you could customize a Sackboy, and he became the symbol for your PSN account. Then you could take him into other games. Like, say Sony made a Mario Kart game. Instead of using Mario, Luigi, etc etc you would just use your own Sackboy. Story mode you'd play against stock Sackboy characters, but online you'd play against everyone elses Sackboy. Sorta similar to the Wii system (playing with your Mii in Mario Kart), but obviously a thousand times better because Sackboy > Mii.
It's all about the game.
