Primary

• Yuuta Matsumoto Friend of Takeru Aizawa
• Yuuta Matsumoto Son of Yuuta's father
• Yuuta Matsumoto Student of Aiko Saitou

Extended

• Takeru Aizawa Younger Brother of Chizuru Aizawa
• Takeru Aizawa Younger Brother of Eiko Aizawa
• Takeru Aizawa Friend of Yuuta Matsumoto
• Takeru Aizawa Friend of Squid Girl
• Takeru Aizawa Student of Aiko Saitou
• Takeru Aizawa Friend of Shouta Kuroishi
• Yuuta's father Father of Yuuta Matsumoto
• Aiko Saitou Teacher of Takeru Aizawa
• Aiko Saitou Teacher of Yuuta Matsumoto
• Aiko Saitou Teacher of Shouta Kuroishi