18 (Chapter 58)
|Voice Actor||Yahav Rom|
|Anime Debut||Overflowing is Embarrassing|
Kenta Usui (雨水 健太, Usui Kenta) is the first human to have found out Karin Maaka's secret. At Anju Maaka's suggestion, the Marker family make him an ally to aid in caring for Karin during the daylight hours. He is also known for looking like Ichigo Kurosaki, the main character of Bleach.
Kenta and his mother live in a one-room apartment and do not have much money, due to his mother's struggle with getting/keeping a job. Consequently Kenta cannot afford three meals a day, often leaving him hungry during the middle of the day. Karin, realizing this, begins making him a bento box lunch every day after he finds out her secret. Kenta works with Karin part-time at Julian's Restaurant, seeking all the extra hours he can to support himself and his mother. He dreams of being a model citizen with a family and a good job, though he does marry Karin in the future as stated in the manga.
As a child, Kenta was ignored by his maternal grandmother due to the circumstances of his birth. This leads to his being a person who tries to live a life free of prejudice and allows him to sympathize with Karin's unusual nature.
Kenta offers his neck to Karin to bite whenever she needs so she won't have any more nosebleeds. Karin ends up biting him twice, with the second bite following their first kiss. When Karin is kidnapped, Kenta aids the Markers in tracking her down, led by Sophia Pistis, the spirit of the first Psyche. While they are there in Kenta's hometown and at Karin's suggestion, Kenta goes to see his sick grandmother, not wanting to lose the last chance to reconcile with her.
- He was born in 1988.
- His birthday is on February 29, meaning he only celebrates his birthday every four years. Appropriate because of his poor conditions.
- Although he's supposedly 16-18 through the manga, actually he only has his 4th birthday throughout the entire series.
- Because he knows that Karin is a vampire, he often runs away and laughs in privacy about Karin's unusual jobs.
- When Karin injects her blood into Kenta, temporarily the consciousness of Sophia Pistis accompanies him. Sophia takes the form of Karin and aids Kenta in crisis.
- Although Sophia knows James Marker, she doesn't want her existence to be known by any other member of the Marker family.