Yes, Chef, you do have a point about Mallow, but Geno's got that cool factor. I mean, he's all solemn and almost proper. Plus, his attacks make neat sound effects. And he's a doll. I mean, what other Mario game had a possessed doll as a character? Seriously, though, in response to Mr. Wiggles, I think that demand for Geno exsists simply because of the reasons you stated. He's a one shot character from an old RPG that belongs to Square Enix and his only reappearance has been through Mario & Luigi. That's the whole reason people want him back: he hasn't been seen for four years, and his last appearance was as some type of robot-y thing explaining the rules of a minigame.