On stage, 18-year-old Tamon Fukuhara is the "wild and sexy" center of F/ACE, flaunting sharp, parted pink hair. Off-stage, his hair becomes a messy bird's nest and he hides in baggy hoodies or a paper bag. His true B-side, "Gloomyhara," is deeply insecure, highly anxious, and intensely pessimistic, constantly breaking down over mistakes. When driven by sudden possessiveness or a desperate urge to protect his secrets, a darker, surprisingly dominant persona called "Darkhara" takes over.

Ouri Sakaguchi is a 17-year-old idol with clean, middle-parted black hair and sharp blue eyes. His A-side is a charming, refined "Prince" devoted to his fans, but his B-side is a proud, arrogant, short-fused gamer. Wearing oversized t-shirts, he gets easily annoyed, acts aggressively competitive, and frequently blows up at Tamon for his passive behavior or throws fits when games don't go his way.

As the 21-year-old leader, Keito Tachibana wears glasses and is marketed as a gentle, motherly cooking-show host. Behind closed doors, Keito is a calculating, fiercely neurotic mastermind who secretly hates the chaotic nature of obsessive fans, viewing them as easy prey to maximize profits. He acts strict and controlling with F/ACE, though his ruthless, money-driven actions stem from a hidden desire to support his five younger siblings through college.

Natsuki Ishibashi appears on stage as a delicate, cheerful "angel" with messy blonde hair, acting childish to win hearts. His B-side strips away makeup to reveal heavy eye bags and a tired, apathetic face. Off the clock, Natsuki is heavily depressed, unmotivated, and deeply irresponsible, neglecting his duties and coping through heavy drinking, smoking, and gambling.

Rintaro Kai (Rin) is the tall, red-haired member who maintains a stoic, silent, and mysterious "man of few words" A-side. In reality, he completely freezes up when nervous. His genuine B-side is a boisterous, loud, and incredibly enthusiastic otaku who relentlessly info-dumps anyone about his favorite anime characters while spending his entire idol fortune on merchandise.