Sign: Mimiru, Sora, Bear
Original Games: Blackrose, Kite, Natsume, Mistral
Liminality: Mai Minase
Legend of the Twilight: Ouka, Kazu/Sanjuro and Silver Knight (Depending on whether it's the manga/anime), Balmung
Roots: Gord, Phyllo, Silver Knight
GU: Alkaid, Haseo, Khun, Zelkova, Bordeaux
Yeah, a pretty large list for me.