I love them all, even Deku, but I needed to vote FD. Come on, yes, it's limited, but who DOESN'T LOVE slashing a dark hexing mask three times and killing it?!?! Hey, it was an awesome fight for me. Here's my list, though.
FD
Zora
Link
Goron
Deku
Yes, Zora is my second choice, specifically because he can Dolphin Dive and Mermaid Swim. Who doesn't love THAT?! Then Link, cuz, you know, he's Link, then Goron, cuz I love Gorons, and Deku, because I was trapped as a Deku for a while, and I hate being trapped.