Kojou Akatsuki
She sees him as her brother figure.She may have feelings for him.
La Folia Rihavein
they both share a connection with each other as aunt and niece, duel to the fact they both have the same feelings for kojou and it could be possible if la folia and Kannon being rivals, but they do love each other as a family.
Lucas Rihavein
Polifonia Rihavein
Yukina Himeragi
They are good friends.
Nagisa Akatsuki
They are good friends.