Tamon Fukuhara stands as a central figure in the narrative, introduced as an 18-year-old high school student and member of the idol group F/ACE. His distinct appearance features pink hair—dyed during F/ACE's audition program as a confidence booster, symbolizing love—and grey eyes. He frequently wears hoodies outside performances. His physical presentation sharply contrasts between two states: as "Hottiehara," his hair is neatly parted; as "(Mr.) Gloomyhara," it becomes messier. Periods of intense gloom trigger a unique physiological response where mushrooms, termed "Gloomshrooms," sprout on his head and living space, linked to humidity.

His personality starkly divides between public and private personas. On stage, he embodies a 'sexy and wild' idol identity, captivating fans to extremes that provoke intense physical reactions like nosebleeds. Off stage, he exhibits chronic anxiety, overwhelming self-doubt, and a tendency toward despair. Minor mistakes trigger profuse apologies, self-deprecation, and occasional suicidal ideation, yet he demonstrates underlying care and consistent effort to please others.

Tamon auditioned for F/ACE at age 16. Now 18, he is the group's second-youngest member and resides below fellow member Ouri Sakaguchi, establishing a neighborly connection. His development involves gradual shifts between his personas, particularly around Utage Kinoshita, who coins his dual nicknames and observes the blurring of his identities. This merging occasionally manifests without prompted hairstyle changes, signaling evolving self-presentation.

His key relationship involves Utage, who discovers his private struggles while working as his housekeeper; her persistent support forms a core narrative thread. Interactions with other F/ACE members, like Ouri, occur within group contexts. His manager appears in character listings. Across all official media, including manga volumes up to at least Volume 8, his growth centers on navigating dual identities amid Utage’s influence.