Hachisuke Takamizo is a male supporting character from the visual novel and anime adaptation of Happiness!. Known by the nickname Hachi, he is a second-year student in the general curriculum at Mizuhosaka Academy. Hachisuke has a youthful appearance typical of a teen, with spiky black hair that reaches his ears and yellow or grey eyes, standing at a height of 176 centimeters.

He possesses a loud, energetic, and funny personality, often describing himself as a refreshing nice guy. In reality, he has a distinct lack of charm or success with women, a fact he remains oblivious to despite his best efforts. He openly enjoys the company of girls and can be very perverted, yet his desperation for female affection is notable. Among female characters, he holds a particular admiration for Haruhi Kamisaka, going so far as to be a member of her official fan club. While his primary goal is to attract girls, his close friend Jun Watarase, who has a very feminine appearance, is ironically the most likely candidate to provide him with the romantic attention he seeks.

Hachisuke serves as a close friend and comic relief companion to the main protagonist, Yuma Kohinata. Alongside their friend Jun Watarase, the trio is almost always seen together. He has known Yuma since middle school, and the three share a strong camaraderie. Within the group, Hachisuke is frequently the target of jokes and teasing, particularly from Jun, establishing his role as the one who is often made fun of. No specific information is available regarding any notable magical or special abilities possessed by Hachisuke, nor is there a distinct narrative arc describing his personal development throughout the story.