Hmmm, I dunno; Let's ask Mario. . . .

Yup, it's official: When none of the Nintendo girls are keeping an eye on him, Mario runs off.

Paper Mario I like Koops, Bow, Watts and Sushie. If I had to pick between one of them I would probably say I used Koops the most to get rid of so many annoying little enemies. Paper Mario TTYD I like Spike and Bobbery were my favs...Bobbery probably my fav.stike22

In PMTTYD, there's no character named Spike, and Koops is from PMTTYD, not Paper Mario.

Although not exactly my favorite from Paper Mario (I don't really have a favorite in the original) I'll have to put down Watt, because I feel bad about forgetting about her. (Yes, HER. Watt is a girl.)

For Paper Mario The Thousand Year Door, I'd have to say Vivian. Mostly because at the end when she was about to tell Mario she thought she loved him, I made a joke in which she said she loved Goombella instead. :P

I haven't played Super Paper Mario yet, but from what I saw on Youtube, they all seem to be boring little fairy's of various shapes, which is lame for the third Paper Mario game.