Movie
Description
Ranmaru Kurosaki is a 22-year-old male with dyed silver hair, a style maintained since childhood, and natural silver eyes. He often wears one purple contact lens for an aesthetic heterochromia effect, paired with dark grey eyeshadow. Standing 182 cm tall and weighing 67 kg, he has a Libra horoscope and blood type A. His signature fashion features skin-tight clothing and a houndstooth checkered vest.

Born to a Japanese father and an Italian-American mother, Ranmaru's wealthy family once rivaled the Jinguji and Hijirikawa clans. His father faced betrayal by a colleague, leading to the Kurosaki Group's bankruptcy and crippling debt. Following his father's death from overwork, Ranmaru took on the debt burden, distancing himself from his mother, Giulietta, and younger sister, Juri. To repay the debt, he became an idol. Multiple bands he joined disbanded after members left for romantic relationships with women, deepening his distrust.

Personality-wise, Ranmaru exhibits tsundere traits, often appearing moody, reactive, and standoffish. He fiercely identifies as a rock musician and initially displays misogyny, refusing to work with female composers due to past band breakups and his father's betrayal. Despite his abrasive exterior, he possesses a strong sense of duty and hidden compassion. He feeds stray cats, cooks skillfully, and cherishes a childhood stuffed bear. He is known for his ability to fall asleep instantly during short breaks to cope with a demanding schedule.

As bass guitarist for the idol group QUARTET NIGHT, he affectionately calls his instrument his "girlfriends." He mentors childhood friends from his affluent past, Masato Hijirikawa and Ren Jinguji, though their relationship strained after his family's downfall. His group interactions reveal his complexities: he flusters easily under Cecil Aijima's flattery, frequently argues with Camus (who uses nicknames like "Dandelion Head"), and is a common target for Reiji Kotobuki's pranks. Despite reluctance to form bonds, he gradually develops camaraderie within QUARTET NIGHT.

Across media, Ranmaru confronts his trust issues. In the anime's second season, he mentors with cynicism, criticizing dependence on others and dismissing decisions like Cecil's entry into idol work. He shows subtle growth, such as not opposing Cecil's inclusion in STARISH. Further explored in the *All Star* game, he learns to value collaboration and overcomes his aversion to non-rock music after being moved by STARISH's performances. Key moments include helping an elderly couple repay Yakuza debts, revealing his underlying kindness and sense of justice.

Additional details include his English fluency from his multicultural background and past U.S. residence, plus a frugal lifestyle in a sparsely furnished apartment. His QUARTET NIGHT theme color is dark red, and he addresses others by their first names, reflecting his informal demeanor.