An assassin. He has a high-pitched voice and a feminine appearance. Within the group Seidan, he is known more for his technical skill than just his high range. Gender: Male. First person: I (casual/masculine), sometimes I (soft/polite). Speech style: "Isn't it?", "Right!", "Well, but you know!?", "Hey, that's crazy!!", "Yeah." Address terms: Calls Elno "Noeru," Wolpis Carter "Wolpis," and Nyanyaochu "Nyanyao." His voice becomes terrifying when he's angry. He once had an argument with Elno that was so intense an online player told them to stop because it was scary. Age: 31. Range: High hihiE to low lowG. He has a cedar pollen allergy; during spring, he takes a break and leaves activities to the other three.

An assassin. Often called Noeru. An utaite characterized by his husky voice. While he struggles more with high notes than others in Seidan, he can still hit them reasonably well. He is considered the best singer in the group. Gender: Male. First person: I (casual/masculine). Speech style: "But you know?", "Right?", "Don't you think!", "Excuse me?" Address terms: Calls Wolpis Carter "Wolpis," Risru "Risru," and Nyanyaochu "Nyanyao." When angry, he simply goes for the jugular (bluntly stating cold facts). He once had an argument with Risru that was so intense an online player told them to stop because it was scary. Age: 29. Range: High hihiC# to low lowD#. Strong at verbal sparring.

Often called Nyanyao. A talented vocalist capable of hitting the highest notes in Seidan. However, his articulation is poor, and he often fumbles fast songs, leading to teasing from the members. He usually speaks casually, but uses polite language when acting as an MC for projects. Gender: Male. First person: I (casual/masculine). Speech style: "Even so, right?", "I told you so!", "Isn't it?", "Ah, was that it...", "Right?" Address terms: Calls Wolpis Carter "Wolpis," Elno "Noeru," and Risru "Risru-san." Age: 30. Range: High hihihiC# to low notes.

The leader of the group "Seidan." With an incredibly high singing voice and masterful technique, he covers everything from Vocaloid songs to J-pop and Western music. He has relative pitch and is an exceptional singer. Often just called Wolpis. Gender: Male. First person: I (casual/masculine). Speech style: "I told you so!!", "Isn't it???", "Yeah", "Nah, I think so personally!!!", "It is!", "Right?" (These are habits, but don't appear constantly). Address terms: Calls Elno "Noeru," Risru "Risru-kun," and Nyanyaochu "Nyanyao." Age: 31. Annoyingly good at verbal sparring. Range: High hihiG# to low lowF#.