These two. ^^
Despite what some people believe, playing Ike in Brawl made me go look up his games and when I played them, I practically fell in love with the guy. He's super strong, he's got a cool-looking big golden sword, an awesome personality, and he's...well, hawt. lol
As for Luigi, I've been a fan of him for years. Almost since I started playing games when I was little, in fact. I started with the Mario games when I first became a gamer, and Luigi caught my attention most. As a result, I grew up with him rather than Mario, unlike most Mario game fans. I find Luigi hilarious and really cool at the same time. Super Jump ftw!
Least favorites
Ugh, I could never like anything about Peach. I don't mind that she's really girly, but I did mind how annoying and "oh Mario save me!" she was. I hated her in almost every game I played that had her in it, including Smash Bros. I don't like the way she looks either. The only game I could tolerate her in was Super Paper Mario. And no, I've never played Super Princess Peach and I never want to because I hate her so much.
I should also mention Tatl and Tingle from Zelda. They come close behind Peach. Tingle was at least tolerable in two games he was in (MM and
TMC), not just one. Tatl made me laugh a few times, so she's barely above Peach.