Chidori resembles the sin of Envy. Her updated sin is "Goody-Two-Shoes." Her identification when she experiences pain is D-5. Chidori was first portrayed as clumsy, emotional, and seemingly nosy at times. She seems to sincerely care about all of the other Kiznaivers, especially Katsuhira Agata _(Chidori's childhood friend)_ and tries to cheer them up when they're upset. She got embarrassed rather easily, and had been told by Tsuguhito Yuta that she was "too heavy" when it comes to her emotions. If too embarrassed or irritated, she would hit the person who caused those feelings. Chidori was called "Two-Goody Shoes" by Noriko Sonozaki. She has a tendency to take care of others, as seen when she cooks meals for Katsuhira and Hajime Tenga, and also when she tries to solve Katushira's problems for him by talking to the teachers about his being bullied and demanding that the bullies return his money. She is very defensive of her friends, especially Katsuhira because she knows he won't defend himself out of apathy.

Spoiler

Chidori fell in love with Katsuhira during their childhood and very much wished for him to return to his original kind and funny personality. She was very upset when she realized that he would not return her feelings, but also understood that she could not make him do so and that continuing to try would be selfish of her. In the end of the anime, it looks like she might end up having feelings for Tenga in the future.

(Source: Kiznaiver Wikia)