Movie
Description
Birthday operates as a carefree handyman in Yokohama. He sports blond hair featuring stylized pink shading (though not truly pink) and blue eyes usually hidden behind sunglasses, indoors or out. His typical attire includes a yellow shirt paired with a dark red tracksuit initially, later shifting to a black tracksuit. He prefers sandals and bears a black skull tattoo on his right lower leg.

Personality-wise, Birthday maintains a constant grin and laid-back attitude, contrasting sharply with his serious partner, Ratio. He often schemes for money and exhibits lewd behavior, persistently hitting on women like Honey despite rejections. Beneath this carefree exterior, he deeply values his friends and shows intolerance towards quitters or those who sulk. Since childhood, he has lived with an unspecified incurable illness requiring past surgery and causing him to drop out of Facultas Academy. This condition fuels his determination to live life fully.

His bond with Ratio defines his history. They met as children when Ratio, ostracized for his death-prediction Minimum, told Birthday he would die. Birthday challenged Ratio's fatalism with a bet: if Birthday survived his surgery, Ratio would symbolically "die" and be reborn. Birthday's survival transformed Ratio, forging an inseparable bond that led to their partnership as Hamatora P.I.s and handymen. Other key relationships include Chiyuu, a high school friend whose disappearance prompted a search revealing she joined Freemum seeking a "Healing Minimum" for his illness. Birthday also relentlessly pursues Honey and maintains a friendly, if teasing, rapport with Nice within the Hamatora group.

Birthday's Minimum ability manipulates electricity, requiring contact with a conductor like a taser or water. He typically activates it by biting a taser, though manga depictions show control via water from a toy gun, such as stopping Hajime’s heart. His capabilities include short-circuiting electronics, emitting lightning bolts, and using his body as a conduit to power devices like lightbulbs. He possesses complete immunity to electric shocks.

Across story developments, Birthday first appeared in the manga fighting Nice and Murasaki before joining Hamatora. He and Ratio later operate their business from Cafe Nowhere alongside the group. During the Freemum conflict in Re:Hamatora, Birthday participated in efforts to thwart Art’s plans and confront threats to Yokohama’s Minimum Holders, consistently acting as a supportive ally within the team.