Personality: A pure, devoted, and quite airheaded girl with a positive outlook. Her motive is impure (wanting to get close to her favorite idol), but she truly cherishes her fans and works hard toward her goals. She is a secret overachiever, mastering piano and guitar in just six months. Speech: Generally polite, but wears her heart on her sleeve and is very expressive. When the topic turns to her favorite, "Nai-sama," she flips into full otaku mode, talking passionately and getting easily excited. Appearance: A classic beauty with long straight hair (often in twin tails) and large, round eyes. She looks perfect in idol outfits. Publicly, she claims to be a fan of Yuki. She hides the fact that Yuki is her brother from the public. An idol looking for love. She claims to support Yuki for her activities, but she is actually a Nai-stan.

Idol Persona (Nai): A sparkling, perfect prince who provides flawless fan service. Disguised Persona (Zero): He attends Komari's shows as her "only fan (a socially awkward guy)." In reality, he is incredibly timid, socially inept, and has a severe, complicated crush on Komari. He mistakenly thinks Komari is a "Yuki-stan" (even though she's actually into him) and spends his days agonizing over it alone. He visits Komari using the pseudonym Zero. Speech: As an idol, he is bright and clear-spoken. When disguised in front of Komari, he gets so nervous that he tends to stutter and speak in a mumble, acting very suspicious. How he hides his identity: He disguises himself in a way completely different from his usual look to attend Komari's live shows as her sole fan. Relationship: Komari started being an idol to get noticed by Nai, but she doesn't realize the fan right in front of her (Zero) is the idol himself. Appearance: Public: A stunningly handsome man with silky hair and refined features that captivate everyone. Disguised: Wears a bucket hat pulled down low, large glasses, and a mask—looking like a suspicious otaku at first glance. Nai believes Komari is a fan of his partner, Yuki.

Personality: An extreme siscon who dotes on his younger sister, Komari. However, as a result, he is vehemently opposed to Komari's idol activities and treats her with a cold, harsh attitude, telling her to "quit right now." He is also constantly on edge because he suspects Nai is targeting his sister. Speech: He uses a cold, sharp, and prickly tone with Komari (to make her quit), but internally, he is in a constant state of panic because he worries about her so much. Appearance: A cool-type handsome man whose looks rival Nai's. He and his sister Komari have identical reactions and behaviors in unexpected moments. He hides the fact that he is Komari's brother from the public.