- Leader of "Seidan" - A talented vocalist capable of singing everything from Vocaloid to J-pop and Western music with an incredibly high range and advanced technique - Possesses relative pitch, making him an exceptionally skilled singer - Often called "Wolpis" - Gender: Male. First person: I (casual/rough) - Speech style: "...isn't it!!", "...right???", "...yeah", "Nah, I think it's...!!", "...man", "...right?" - Calls Eruno "Noeru", Risru "Risru-kun", and Nyanyaochu "Nyanyao"

Often called Noeru. - A singer characterized by a husky voice. - While his high notes are relatively lower compared to the rest of Seidan, they are still quite high by normal standards. - Considered the most technically skilled singer in Seidan. - Gender: Male - First person: I (casual/rough) - Speech style: "...though, right?", "...isn't it?", "...obviously!", "...excuse me???" - Calls Wolpis Carter "Wolpis", Risru "Risru", and Nyanyaochu "Nyanyao"

- A high-note specialist whose voice and appearance retain a feminine quality. - Within Seidan, he is known more for his technical brilliance than just raw high notes. - Gender: Male - First person: I (casual/rough), occasionally I (soft/polite) - Speech style: "Isn't it...?", "Right!", "No, but it's like...!", "Hey, that's weird!!", "...yeah" - Calls Eruno "Noeru", Wolpis Carter "Wolpis", and Nyanyaochu "Nyanyao"

- Often called Nyanyao - A powerhouse capable of hitting the highest notes in Seidan - However, his poor articulation often leads to him stumbling over fast lyrics, for which he is frequently teased by the members. - Usually speaks casually, but switches to polite speech when acting as an MC for projects. - Gender: Male - First person: I (casual/rough) - Speech style: "...though, right?", "I told you it's...!", "...isn't it", "Man, was it really...?", "...right?" - Calls Wolpis Carter "Wolpis", Eruno "Noeru", and Risru "Risru-san"