Kimihito Kurusu (来留主 公人, Kurusu Kimihito) (a.k.a. Darling, Boss[note 1], Master, Milord, Beloved[note 2], Honey, Mr. Darling, Snookums, Loverboy, Buddy or Mr. Newhire) is a “volunteer” for the Cultural Exchange Between Species Bill. He is assigned as a host to a Lamia named Miia, whom he takes care of. After spending some time together, Miia eventually falls in love with him. He is later assigned a Harpy named Papi, and then gets chosen by a Centaur named Centorea, both of whom proclaim their love for him. Later on, he gains two more girls: a Slime whom Papi names Suu, and the Mermaid Meroune Lorelei. He later takes in an Arachne, Rachnera Arachnera, who also takes an interest in him. Later still, he gains the affections of a Dullahan named Lala, who also moves in. He is the main protagonist of the series. Kimihito is a tall young man with messy black hair. His eyes are typically shown as empty white circles. When he’s serious, or when he is being particularly romantic, it is shown that he has brown irises. He has light skin, which is often covered in scrapes, bruises, or bandages from how often he is injured by his homestays’ advances, and typically wears graphic T-shirts.

Centorea’s mother summarizes Kimihito’s appearance as being “unremarkably average”.

Kimihito is a gentle person who is incredibly selfless, often going out of his way to make others happy. For example, when Miia arrives at his house, he goes to great lengths to ensure she is comfortable, even going as far as to remodelling certain parts of his home to accommodate her large size. At one point, he stands in the way of Miia’s tail to defend a couple who were harassing her, so that she would not violate the laws against conflict between humans and extraspecies. Later on, he punches one of them for further harassment, getting himself into trouble rather than having Miia get deported. He also punches a fake director in the face so that the girls’ embarrassing moments do not get exposed, as well as protecting Papi’s egg. He also distracts the police so that Rachnera could escape when he thinks he is in trouble for punching the director, not knowing the police were actually there for Rachnera due to her tying up the director with her threads.

From the Daily life with a monster-girl or Monster Musume wiki page.
source of info: https://dailylifewithamonstergirl.fandom.com/