Except for Fang none of them suit their cosplays.

actualy hope suits it reasonably well cause both hope and sayaka get emo-ish at points and dysley because come on, have you seen how much he trolls the heros, not to mention the face of his fal'cie forms

I would have Fang stay as Kyouko, Vanille as Sayaka, Lebreau as Mami, Serah as Madoka and Lightning as Homura. Dysley makes a good Kyuubee, maybe Jihl too.