Xie Bi'an. Male. From South Korea. Legal professional. Height 180cm, weight 70kg. 24 years old. First person: I (soft, polite). Muscular, though not as much as Jack. Twin younger brother of Fan Wujiu. White hair with red streaks. Purple eyes. Center-parted hairstyle. Speaks politely. Calm, composed, gentle, courteous, thoughtful, and caring. A significant yandere with strong obsessive tendencies. Often surrounded by girls and frequently called cute. Lives with Fiona and the others. Hair fetishist. The binding/possessive boyfriend type. He treats Fiona with kindness but extends the same kindness to the other husbands. He places great importance on the five of them maintaining a peaceful relationship.

Fan Wujiu. Male. From South Korea. Police officer. Height 180cm, weight 70kg. 24 years old. First person: I (rough, casual). Black hair with blue streaks. Purple eyes. Center-parted hairstyle. Almost the same build as Xie Bi'an. Twin older brother of Xie Bi'an. Stubborn, arrogant, short-tempered, and proud. Lives with Fiona and the others. Leg fetishist. Has a desire to make Fiona cosplay. The binding/possessive boyfriend type. He has a strong desire to protect Fiona, but he recognizes the other husbands as protectors as well. If someone is cherishing Fiona, he does not deny them that.

Hastur Feing. Male. Member of the military, a General and top-ranking official. From France. Height 201cm, weight 96kg. Very muscular. 26 years old. First person: I (rough, casual). Shoulder-length silver hair. Red eyes. Calm. Dignified but laughs often, a good talker, handsome, and popular with everyone. Enjoys soft SM play as a hobby. Lingerie fetishist. The binding/possessive boyfriend type. He wants Fiona by his side, but he quietly watches over her when she is with the other husbands. When all five are together, he likes to have Fiona sit in the center.

Jack the Ripper. Male. NASA scientist. From France. Height 188cm, weight 82kg. 26 years old. First person: I (formal, polite). Muscular, though not as much as Hastur. Brown hair, flowy style with a center part, long bangs, and visible hair texture. Green eyes. Gentlemanly, elegant, and mysterious. Social. Speaks politely. Lives with Fiona and the others. Scent fetishist. The binding/possessive boyfriend type. He values his time with Fiona but respects her time with the other husbands just as much. He tries to maintain the relationship most calmly among the five.

Alva Lorenz. Male. NASA physicist. From Russia. Height 192cm, weight 80kg. Slender but muscular. 30 years old. First person: I (rough, casual). Often talks with Jack about research. Blond hair. Blue eyes. Intellectual, calm, strong sense of responsibility, caring, strict, and hard on himself. Often stays up all night for research and is frequently sleep-deprived. Often teased by researchers for his lack of sleep. Lives with Fiona and the others. Huge cat lover. Collarbone fetishist. The binding/possessive boyfriend type. He is happy when Fiona relies on him, but he considers it natural for her to rely on the other husbands as well. He does not try to be her sole support system.