La Folia has strong feelings for Kojou. In the OVA she said that she will marry him instead of another man. She also kissed Kojou and made the other girls jealous.
Kanon is her aunt, and they seem to be on good terms.
La Folia currently has a disagreement with him about her suitor: she insists that Kojou should be her suitor while Lucas insists that she marry someone else. He even went as far as trying to engage her with a suitor of his choosing. Even in the end of the OVA, Lucas is still somewhat reluctant about considering Kojou as a potential future son-in-law.
They are on good terms, and Polifonia trusted her enough not to mess up during the time she was at the terrorists' mercy in the OVA, believing that she 'knows what to do in this kind of situation'.
She also seemingly supports La Folia's decision to choose Kojou as her suitor.
Sayaka was her observer/bodyguard during her visit to Itogami Island. They seem to be on good terms.
They seem to be good on terms and rivals for Kojou Akatsuki's feelings.