Team ninja actually did release this as their generated tier list.
U - Akira
S - Leifang, Hayabusa, Kasumi, Ayane, Gen Fu
A - Bayman, Pai, Eliot, Christie, Helena, Momiji, Hayate, La Mariposa
B - Jacky, Rig, Jann Lee, Hitomi, Mila, Zack, Sarah, Kokoro, Leon, Honoka, Bass, Marie Rose, Tina...