Tsukiko Kobayashi is the protagonist. Snobby, selfish, and confident, she can't stand the possibility of being incorrect, and she carries herself with her confidence. She can be smart-mouthed and arrogant, but she's incredibly intelligent, able to easily solve trials and knowing how to push people over the edge. She is from Japan.

Voice Description: Smooth and calm, her voice is rather addictive to listen to in a way, she's also very convincing, so despite the stuff that comes out of her mouth sometimes people can't help but agree to what she's saying.