I'm a fan of most Nintendo things, so of course. It's hard for me to think of any character I want though since a lot of Nintendo characters with any chance of getting in are usually bland protagonists and probably one of the worst thing about most games (but Nintendo does it better than most companies though). The only character that had any real chance of getting in that I wanted was Meta Knight so I was incredibly happy he got in. There's a bunch of reasons why I love Meta Knight (some of them taken out in the remake strangely enough though), and I met him when I was a kid so he was the first character that I saw do a few things. Particularly a duel. Another character I wanted in was Ridley, who does have some overlap with Meta Knight for some of the reasons why I like him (mainly a recurring rival boss character that's fast). I've only played 3 Metroid games though (Super Metroid > Metroid Prime 2 > Metroid Prime).
My most wanted characters right now would be Dark Samus and Ghirahim. Skyward Sword is brought down because the difficulty doesn't know if it wants to be pitifully easy, or require you to pay attention so it's hard to get into the mood when it's constantly changing, also because of Fi talking too much but it's awesome in every other way. Ghirahim is just one of my favorite characters, once again, I love recurring boss rivals. Ghirahim is such a fun character. Also sword+projectile+teleporting+speed sounds like a pretty good combo to make me like him. Dark Samus, once again, recurring boss rival, but I'm also a fan of dark versions of characters. Dark Samus's fighting style is nothing like Samus funnily enough, so I'd love to see her get in with it's own moveset, because if it didn't, why not just keep it as a skin?
I'm sure there's a bazillion other characters I love but they are more obscure so it's harder to remember them.