Keisuke Harukaze serves as father to Doremi and Pop, employed as a journalist for a fishing magazine. This role necessitates frequent travel, aligning with his near-obsessive passion for fly fishing. He invests heavily in poles and lures, often slipping away during downtime to fish, yet contributes by bringing home catches for meals.

Kind-hearted but bumbling, Keisuke employs dorky humor to diffuse family tensions. His childlike, airheaded streak surfaces when resisting criticism—especially about hobbies—triggering arguments with wife Haruka despite their mutual affection. He habitually dodges household chores, provoking her frustration.

Physically tall with slightly tanned skin, Keisuke sports short dark spiked hair and small eyes behind glasses. His daily outfit includes a lavender button-up over a white shirt, a multi-pocketed dark green vest, blue jeans, and purple-and-white sneakers. For formal events, he chooses a pale brown tuxedo with green jacket, dark purple tie, brown scarf, and brown shoes.

He shares playful rapport with Doremi, nurturing her fishing interest and consoling her after failures—like offering steak post-piano recital. He permits Pop to sit on his knees during TV time and voices confidence in her abilities. His parental bonds vary: warm with mother Riku, strained with father Yuusuke.

Additional notes mention an unsubstantiated infidelity accusation involving Haruka, Keisuke's soccer enthusiasm, and his consistent use of green house slippers—potentially hinting at a color preference.