Rio Kamichika

A female classmate of Masaomi.

She catches her father cheating on her mother and starts having thoughts about suicide.

Her online chat name: Magenta and she's a member of Dollars.

Background
After she discovered that her father was cheating on her mother, she always thought about what happened if she disappeared. She accidentally found someone in online chat screen named "Nakura" (who is no other than Orihara Izaya) that wanted to disappear without a trace too. Rio felt a connection between her and Nakura and started to chat online. Rio told Nakura her problems and also Nakura. Until one day, Nakura asked Rio if she wanted to disappear with him.

Rio felt confident when she left her house. She wanted to see the face of the person that feel the same way as her. A person who claimed to be Nakura appeared and take her to a van. But she was tricked and the "Nakura" kidnapped her with the help of his two friends. Although seems no one sees that, Izaya happened to be a witness. Later, a black bike came to the rescue of Rio and saves her. Celty said that someone is waiting for her at a top of a building. Rio walked in and found the real Nakura, Orihara Izaya.

As usual, Izaya played around with her, telling that he is the one who told the guys to kidnap Rio, but also the one who told Celty to save her. Rio gets confused a little. She asked him why did he do it, but Izaya only gives a strange answer: it's because I like humans.

Izaya's word upsets Rio and tried to slap him, however she missed and almost fall. Izaya grabbed her and leaves her on the roof. Rio thought about jumping from the roof. She hesitated at the start, but she jumped anyway. Celty helped her again by using the steel stair's shadows and grabbed her. Rio asked why she saved her. Celty said that: because the world isn't as cruel as you (Rio) think.

After that Rio decides to forgive her parents. She started to change her point of view in life and wanting to share that words to someone.