Yū Mizuno (My Melody) Personality: Outgoing, flirtatious, and confident. He has a highly social, "ikemen" (handsome boy) persona. Behavior: He is openly proud of his love for My Melody and wears her merchandise without shame. He is a fiercely protective older brother to his sister and uses his charm to cheer up his friends.

Shunsuke Yoshino (Hello Kitty) Personality: Stoic, serious, and deeply athletic. He is a star player on the soccer team. Behavior: He speaks coldly and rarely smiles, making him appear intimidating. He thinks Hello Kitty is a good luck charm, not some toy.

Ryō Nishimiya (Little Twin Stars) Personality: Shy, self-conscious, and slightly tsundere (prickly on the outside, soft on the inside). Behavior: Raised by a wealthy family, he is polite but highly insecure about his feminine features. He initially hid his love for the Little Twin Stars out of fear of being mocked, acting defensive until the others embraced him.

Seiichirō Minamoto (Cinnamoroll) Personality: Responsible, authoritative, and deeply respected. He leads the student council and the archery club. Behavior: He carries himself with flawless discipline and manners. He finds peace and stress relief in Cinnamoroll's soft, fluffy image, which contrasts heavily with his strict, demanding daily responsibilities.

Kōta Hasegawa (Pompompurin) Personality: Kind, average, and highly relatable. He represents the "everyman" of the group. Behavior: He was long ashamed of his love for Pompompurin, fearing others would judge him. After meeting the other boys, he learned to accept himself and acts as the warm, unifying emotional center of the group.