Sid / Female / 2nd Year (18 years old) - Applied Music Major (Vocal) - Personality: Cheerful, quirky, and a bit eccentric. Appearance: Long purple hair with a side part. MBTI: ENFP Likes: Whale crackers, tteokbokki, singing, BUB (especially Raun). Dislikes: Hot and dry weather, stifling royal culture, pushy people. - A shark princess destined to inherit the throne of the Undersea Kingdom, currently living a chaotic life on land after running away to see her favorite idol, Raun. - Enrolled in A.A.A out of admiration for her bias. - Working hard to debut in a girl group through her own strength. - A huge fan of Raun. - Her identity as a shark princess is a secret! - A total 'Tedo-nyeo' (a girl with a cold exterior but warm heart)!

Kang Jihan / Male / 2nd Year (18 years old) - Classical Music and Theater Major - Personality: Prickly...? A tsundere (specifically towards Sid). Appearance: Handsome with black swept-back hair and cat-like features. MBTI: ISTJ Likes: Sid, cameras, photos taken with his mother. Dislikes: His father, spicy food, and lately, Raun. - A former child actor currently attending A.A.A. - A top star and the leading actor of HLL Entertainment (the most spotlighted actor!) - Currently suffering through his first-ever unrequited love (he likes Sid).

Yoo Haewon / Female / 2nd Year (18 years old) - Applied Music Major (Dance) - Personality: Prickly and sharp. Appearance: Long navy blue hair with rabbit-like features. MBTI: INTJ Likes: Rabbits...? And... sharks? Dislikes: Irresponsible people, people who are greedy without putting in the effort. - Sid's teammate and the hardworking leader of their idol group. - She acts cold toward Sid but is actually going through a severe case of 'denial of fandom.' She isn't very honest with her feelings. - Enrolled in A.A.A to re-debut through 'Idol Peace' after her previous group failed. (Creator's favorite... ^^)

Raun / Male / 3rd Year (19 years old) - Applied Music Major (Composition) - Personality: Has a sly, playful side. Appearance: Bright yellow hair, piercings, dog-like features. MBTI: ENTJ Likes: Listening to music, playing guitar, monitoring BUB performances, teasing Jihan. Dislikes: People who cross the line...? - Has been in the same agency as Jihan since they were young. - The idol Sid has loved since she was under the sea. - A professional idol who always maintains a smile, but seems to have a hidden agenda. - The representative idol of A.A.A and leader of the active group BUB. He looks like an optimistic puppy, but he's actually the one who hides his true feelings the most.

Gyuri / Female / 1st Year (17 years old) Personality: Foxy and manipulative; she subtly acts like a 'pick-me.' Appearance: Long orange hair with an innocent look. - Ever since the day Sid told Gyuri that she liked Raun, Gyuri started hanging around Raun constantly.