Seventeen-year-old rapper Reo Maruyama is the youngest member of AKYR (Akanyatsura). He radiates energetic expressiveness, often showcasing his emotions openly. His appearance features light pink hair, pink eyes, and a short 162 cm stature. He typically wears streetwear adorned with gold accessories, including multiple rings and a distinct fang-shaped pendant necklace. His Exhibition Show outfit is a pink tiger-motif jacket, pink pants with yellow accents, and a red "A.K.Y.R." beanie. Born affluent, Reo's childhood introduced him to hip-hop via his father. His family collapsed when his mother vanished when he was ten, followed by his father abandoning him at twelve, leaving substantial debts. Rescued at fourteen by Iori Suiseki, he joined the yakuza-affiliated Suiseki group to repay the debt. The group's annihilation when he was fifteen inflicted significant trauma, symbolized by #BrightRedSeaOfBlood and #FamilyThatHadGoneCold. After the Suiseki group's destruction, Reo joined AKYR alongside Iori, Zen, Hokusai, and Satsuki. He regards them as his chosen family, idolizing Iori specifically, whom he calls "Aniki" (Big Bro). His daily routine reflects youthful habits: sleeping until noon, playing mobile games during school, and evenings spent with AKYR or gaming. He carries gum, gaming devices, and textbooks. Reo's personality blends brash confidence with underlying vulnerability. He frequently avoids responsibilities by delegating tasks and enjoys charging expenses to Iori's credit card, noted by #OiledUpBillsFromBigBrothersCard. He prefers warm places, sweets, and omurice, disliking bitter foods. His hobbies center on gaming, often shared with teammates Hokusai and Satsuki. He aspires to "become number one" and describes his ideal type as "whoever I like". His fang-shaped pendant phantometal activates when bitten, aligning with AKYR's golden tiger theme. Within the group, Reo uses the pronoun "boku" and addresses teammates familiarly or with honorifics like "Zen-nii" for Zen. He maintains a cheerful persona but harbors trauma from witnessing familial destruction and media intrusion during his youth, referenced as #RudelyFilmingCameras. Reo navigates loyalty to AKYR while processing past losses. He demonstrates awareness of Iori and Zen's protective secrecy regarding phantometal risks but accepts their intentions. His growth is reflected in performances like "CALL FOR FAMILIEZ," emphasizing AKYR's unity as an enduring family.