[@Lucius Cypher] Grafdakka is definitely my favorite fighter who fights for fighting, as well as my by far favorite Machina. However, there's honestly not a lot of stiff competition.

Eos is an ice queen. With no development.
Titania, like all Flamelord characters, always seems to get her interesting character development/fights canceled at the last second. 
Zealot isn't sword Zealot, so I'm not interested. Also, he's shown up for shooting like, one, maybe two arrows. And is a sniper.
Bastion is mostly interesting for her ties to Diana and Victoire, which promptly got ignored and now she's just another sniper.
Marquis is best sniper. Which is the most boring thing to watch in a fight. He's my runner up on style alone.
The Mecha Maids.. I don't know how to place it, but somehow their supreme faith in how if everyone follows their orders, they'll surely win this time, bothers me. I have the same problem with Victoire. Also, more fucking sniping.
Alexi is my own character, so I'm not a particularly good judge.
Cherry is still fresh. Not a lot of showtime yet.
Bonesword doesn't really feel like a machina. Sure, he fights for them, but he doesn't really feel like a machina. Same deal for Alexi, really.
Emu is.. well.. she was emotionless. And she becomes emotionless whenever ice queen butts in. So, eh, she's had like, one half of a scene that almost developed her character? At least she's got a nifty powerset and inspired Artoria?