Note, this is the anime page for Akihiko, for the manga page: Akihiko Kaji.
The most distinguishing aspect of his appearance are his facial piercings including Akihiko's left lip, tongue, and two ear piercings with a gauge. His eyebrows are thin and short and he has eyes that are described as having a bad look to them. He has short blond hair on top of his oval-shaped face, the back of his hair is also short. Kaji has a muscular build whilst also being tall and has long legs.
He occasionally wears a baseball cap and often wears a black T-shirt. Akihiko tends to wear jeans held up by a belt and dark shoes.
Described as scary looking but a nice guy more than once, Akihiko is exceptionally perceptive towards others noting right away that it was strange for Ritsuka to bring someone back, and later realizing why. Most of the time Akihiko is direct in saying what he thinks.
Akihiko is very popular among women and he is known to be a womanizer, and sometimes he is despised for that. He is very passionate but at the same time he is not very good with romance or wooing the person he really likes. Akihiko is described as hot-headed, furthermore, he can also be manipulative and selfish, ignoring other people's feelings, in fact, he defines himself as unfair and a total brat. Although Akihiko seems a tough and self-confident person, he has shown to be insecure multiple times; he suffers from inferiority complexes towards Ugetsu. Feeling himself completely miserable and overwhelmed by the other guy’s incredible talent, Akihiko stopped playing the violin seriously, starting to hate music.
He likes working at a convenience store as he can take all the leftovers home. When beginning the band he did not consider them the types who would bother getting to know each other at first, just interested in playing the music.
For the all covering story on Akihiko in the anime: Akihiko Kaji Anime/Story