Haruto Mikami is a male idol under D-Four Production, standing 185 cm tall with black hair and eyes like dark petrol. Sources list his birthday inconsistently as either January 26 or December 14.

He performs in the veteran idol unit Sankishi ("Three Precious Children") alongside Ichika Saotome and Makoto Susa. Mikami presents a wise and friendly demeanor, yet unleashes cunning calculations to achieve his aims, such as masterminding the planting of his phone in Kanade Amamiya's pocket to secure Kanade's return to D-Four after initially refusing to be scouted.

Mikami holds legendary status within the industry. Past performances, including the famed "Night of One Million Cheers," inspire younger idols like Junya Sasaki. His aspirational catchphrase, "Go beyond the ultimate," drives the rookies he mentors, primarily guiding Kanade and Junya within D-Four.

His hobbies include cooking, sometimes practiced in the agency cafeteria. He maintains a professional, slightly distant rapport with his Sankishi unit members compared to the tightly-knit rookie groups, reflecting their senior status and solo pursuits.