Major minor character.  Yoshino is, as expected from a delinquent, pretty aggressive and intimidating when he wants to be, but this kind of behavior is mostly aimed towards Kotarou Tennouji, since he finds Kotarou's behavior irritating. However, despite claiming to be an "outlaw" many a time, he has a kind streak and a strong sense of justice. He seems to have the makings of a leader and enough charisma to earn himself a gang.