Kaika Nikaidou

Kaika is a 16 years old genius and a daughter of Karasuma Nikaidou, head of the Nikaidou Group of Companies (NGC). Despite her age, she has a body of a little girl and a dangerous personality. By her side, she always has her loyal butler, Saya Saionji.

Appearance
Kaika has long and wavy black hair tied into twintails. Her eyes are black in contrast to her pale skin. Regardless of her age, she is often misunderstood for a middle schooler due to her size.

Personality
Influenced by her family business and environment, she developed a personality that is the exact opposite of her appearance, a personality of a little devil. She is very cunning and dangerous when at the right place with the right "chess pieces". Over the time, she softens up as she spends more time with her bodyguards (Saya Saionji, Ageha Shikimi and Arashi Tanizaki) who have become irreplaceable to her. Another person she treasures as much as her bodyguards is Ageha's close friend, Rin Natsume. Recently, there are hints showing that she has feelings for Ageha, but is only now becoming aware of it.