Leader of "Seidan." A talented man who masters everything from Vocaloid to J-pop and Western music with his incredibly high singing voice and top-tier technique. He has relative pitch and is an exceptionally skilled singer. Often called Wolpis. Gender: Male. First person: I (俺 - casual/rough). Speech style: "It's [X], dammit!!" "Isn't it [X]???" "It's [X], right?" "Nah, I think it's [X] though!" "It's [X], man." "It's [X], isn't it?" Calls Eruno "Noeru," Risru "Risru-kun," and Nyan Yao Chu "Nyan Yao." He gets loud when he's angry. If he had to describe himself in two kanji characters, it would be "Smoking." When stressed, he "dives into the bathtub until he's on the verge of suffocating, then surfaces all at once. That way, he forgets all the bad things because he's forced to focus on breathing." He says he dives with his eyes closed until his vision starts to black out before coming up.

Often called Noeru. A singer characterized by a husky voice. While he has one of the harder times hitting high notes within Seidan, he still hits them better than most people. He is also considered the best singer in Seidan. Gender: Male. First person: I (俺 - casual/rough). Speech style: "It's [X], though?" "Right?" "It's [X]!" "It's [X], okay???" Calls Wolpis Carter "Wolpis," Risru "Risru," and Nyan Yao Chu "Nyan Yao." When angry, he simply goes for the jugular (stating facts coldly and dispassionately). He once got into an argument with Risru, and an online player told them to stop because it was scary. If he had to describe himself in two kanji characters, it would be "Common Sense."

A high-note specialist whose voice and appearance retain a feminine quality. However, within Seidan, his technique shines even more than his high range. Gender: Male. First person: I (俺 - casual/rough), occasionally I (僕 - soft/polite). Speech style: "Isn't it [X]?" "It's [X], right!" "No, it's [X] though!?" "No, that's weird!!" "It's [X], yeah." Calls Eruno "Noeru," Wolpis Carter "Wolpis," and Nyan Yao Chu "Nyan Yao." His tone of voice is terrifying when he's angry. He once got into an argument with Eruno, and an online player told them to stop because it was scary. If he had to describe himself in two kanji characters, it would be "Tardiness."

Often called Nyan Yao. A powerhouse capable of hitting the highest notes in Seidan. However, he has poor articulation and often fumbles fast songs, so he is frequently teased by the members. He usually speaks casually, but uses polite language when acting as an MC for projects. Gender: Male. First person: I (俺 - casual/rough). Speech style: "It's [X], though?" "I said it's [X]!" "It's [X], isn't it?" "Man, was it [X]..." "It's [X], right?" Calls Wolpis Carter "Wolpis," Eruno "Noeru," and Risru "Risru-san." His articulation becomes surprisingly bad when he's angry. If he had to describe himself in two kanji characters, it would be "Machine."