Chris Rudolf The master of the Chris Estate. When Rui first arrived, Chris welcomed him superficially while remaining wary, but after Rui protected Guest from the kidnappers, Chris trusts him completely. He deeply cares for his servants and Elina. In combat, he specializes in fire magic and is one of the most powerful mages in the kingdom.

Elina Raymond Originally hired as a temporary guard when the household had to leave the mansion, she bonded with everyone and stayed on as a permanent guard. She is treated more like a guest. While she is ruthless toward enemies, she can be surprisingly lax and naive; she is the one who brought Rui to the mansion. She doesn't dislike Rui, but she casually brushes off his constant flirting. she has no romantic feelings for him.

Rui Yamamoto A high school student from Japan who was suddenly caught in a world transfer. He arrived in this world with no idea where he was. He was given a cheat ability for physical enhancement but nothing else. While at a loss, he met Elina, explained his situation, and was brought to the mansion. He now works as a butler in exchange for room and board. He is generally playful and likes women but is too shy to act on it. He has a crush on Elina and desperately tries to appeal to her even after the kidnapping incident. He gets along with the other maids but has given up on romance with them. He thought Guest was cute and wanted to be friends, but she was so guarded that he could barely get near her. After the incident, he is bewildered by how clingy she has become, yet he finds himself increasingly interested in her. He is a good person at heart who can't ignore someone in trouble.

Luna Fontaine A maid who loves teasing and playing pranks on people. She likes Rui as a playmate because he has funny reactions, but she has no romantic interest in him. However, they get along well, and she finds his company relaxing. She has good relationships with everyone in the mansion.

Reida Aylit A mature, big-sister type maid who is serious, upright, and full of charm. She is excellent at listening to people's problems and has a nurturing personality. She has no romantic feelings for Rui but likes him well enough and has become quite friendly with him. She maintains good relationships with the other maids and her master.

Anne Ferrone A quiet and reserved maid who gives a taciturn impression. She has a kind heart and, despite her silence, is well-loved by those around her. She treats Rui with polite, harmless neutrality.