Shirahama Kenichi is good-natured, timid and polite person in his second year of high school who loves gardening and reading books. Kenichi was frequently treated as a friendless loser at the beginning of the series, however it all changed when he met Furinji Miu. After the fateful meeting, he decided to stand for himself and be truly strong; or at least, strong enough to protect those who are dear to him. Though he’s constantly considered cowardly at the beginning of the series, he shows that when his loved ones lives are on the line, he’s actually much braver than he appears.
Though it is consistently stated that Kenichi has no talent for martial arts he more than makes up for it with his work ethic. It is due to this and the abnormally intense training regime he is forced to endure that Kenichi has gone from being considered the weakest student in his high school to being able to fight and defeat opponents with many years worth of skill as well as some with borderline superhuman abilities.
Kenichi is kind, compassionate, thoughtful, and moral to a fault. He is against violence and only studies martial arts to protect others, and also adheres to a strict code of morals and refuses to kill or hit women even if it means death. In spite of his strong moral standards however Kenichi can be quite perverted as he will jump at the chance to see Miu or Shigure bathing and also buys pictures of them from Ma (though these pictures are mostly fakes). He also adopted a “fighting style” from Ma called “ecchi mode” in which he attempts to grope women which strangely enough has actually helped him get out of a jam before. As a result of his kindness Kenichi has made many friends some of whom are former enemies and has even managed to unknowingly win the affections of Ma Renka and Li Raichi.
When Kenichi was 6 years old he and his friend Asamiya Ryuuto went to a local convenience store where they traded a pin in the shape of a cat’s face with a then 6-year-old Miu for a pin which bore the yin yang symbol. The two then watched as Miu defeated a group of thugs who were attempting to rob the store and made a promise to become stronger as they got older. Though Ryuuto made good on the promise, becoming the first fist of Ragnarok as well as a member of Yomi, Kenichi forgot about the promise and was bullied frequently.