I love this game, I just wish I had someone to play it with...
Back when family member would play it with me, they were ok with me being Sheik, but I was banned from being Zelda!
I truly excelled with her, because of her powerful smash & strong attacks, her Din's fire move (> + B) allows me to get the smash ball easily & is a reliable longer range attack, I'm pretty good at aiming her final smash & Nayru's love (B) helps quite a bit should people try to gang up on me. (& I can use it to knock Samus' charge shot right back at her, which is very good, seeing how dang popular she is.) Speaking of which, her upper smash attack is also good at hitting multiple foes.
I also like the long range of Farore's wind (^ + B), which makes it very helpful in getting back on the stage & making quick get-aways.
I also sometimes excel with Pit, Wario, Ike, Donkey Kong, Snake & a few others.
It depends on if I'm at my fighting peak or not.