Primary

• Kenta Usui Son of Fumio Usui
• Kenta Usui Husband of Karin Maaka

Extended

• Karin Maaka Brother of Ren Marker
• Karin Maaka Father of Henry Marker
• Karin Maaka Mother of Calera Marker
• Karin Maaka Sister of Anju Marker
• Karin Maaka Grandmother Elda Marker
• Karin Maaka Wife of Kenta Usui
• Karin Maaka Best friend of Maki Tokitou
• Karin Maaka Daughter-in-law of Fumio Usui
• Karin Maaka In love with Winner Sinclair
• Karin Maaka Employee of Julian's manager
• Karin Maaka Student of Class Teacher
• Fumio Usui Mother of Kenta Usui