Regiwi

The well, purely because it's something there in the middle of town that someone could so easily fall into, whereas the others you have to go out of your way to get to.

I'd say pokeball due to the uncertainty of what you're going to get.

Claus from Mother 3. Granted he made it as an alt colour for Lucas but it would of been cooler if... well it's too much of a spoiler to say.

Ice Climbers, just too hard to use for me to bother with. Although actually Pichu has to be, I mean he hurts himself all the time. I bet he couldn't be in brawl because he killed himself with his final smash...

I like them both, Adult Link feels more of a confident character whereas Young Link is more of an adventurous one.