Rio Nakamura

Rio Nakamura is a student in Korosensei's Class 3-E of Kunugigaoka Junior High School.

Appearance
Rio has long, straight strawberry blond hair (blond in the anime and dark blond in the OVA) and grey eyes (blue in the anime).

Personality
Nakamura is a friendly, energetic girl and a bit of a trickster. She's playful, has a bit of a dirty mind, and has been noted to be rather intelligent. She claims to originally be a serious person, something that would prove to be true when she disagreed with Nagisa's proposition to save Korosensei and continue to kill him.

Synopsis
Like the majority of her classmates, Rio debuted in the first chapter; however, she didn't originally get spotlighted until the first Finals Arc where she and Nagisa were the main rivals to Tomoya Seo in English. Before that, she was introduced during Chapter 18 where she was trying to peek in on Korosensei while he was bathing.

She gets another spotlight in Chapter 111, where she reveals her past as a gifted, but lonely elementary school student. She was the top student, but felt lonely and unsatisfied and wondered how would it be feel to be a normal student. Since then, she decided to "be stupid", by shirking off her studies and acting playfully. In the process, she completely forgot how to study and how take tests, prompting her fall into Class E. She expresses her gratitude to Korosensei for providing her with a place where she can both study and do "stupid things" along with her friends.

At the end of Chapter 142, when Nagisa proposes to find a way to save Korosensei instead of assassinating him, Nakamura is the first to speak against it. She cites the bond between assassin and target the the very reason why she wants to continue killing their teacher. Her disagreement eventually causes the class to split into either saving or killing Korosensei, prompting him to settle the dispute by having the two factions play a paintball match against each other. Nakamura joins the red (kill) team and acts as second-in-command to Karma Akabane. When the strength of both sides have been cut in half, Nakamura heads to Terasaka's position and lie in wait until the blue team attacks to capture their flag. She reiterates her resolve to kill Korosensei, earning Terasaka's subtle praise. When the surviving blue team attack, Nakamura's group raced for the flag but but were ambushed from behind by Nagisa, thus eliminating her from the battle.

Abilities
Marksmanship: Nakamura is ranked 3rd for marksmanship, girls' side, jointly with Kirara Hazama. They both scored 79/200 in a test in June.

English: Nakamura has a mastery over this subject and apparently the language itself and she's ranked 1st in the school for it.

Nagisa Shiota
Rio sits beside Nagisa enjoys messing with him and harassing him. She gets a kick out of playing on his androgynous appearance and according to the tankobon extra this is one of her hobbies. Despite that, the two are good friends and Nagisa doesn't pay much mind to her teasing.

Trivia

 * Her favorite subject is English while her worst is Civics.
 * Her hobbies are making jokes and sexually harassing Nagisa.
 * She wants to be a diplomat in the future.
 * In the tankobon extras it was revealed that her current nickname is "Old Mannish Middle Schooler" while her past one was "Elementary School Genius."
 * She was paired with Sōsuke Sugaya in Nuru-Nuru Test of Courage in Chapter 74.
 * She was called "Gal English" during Class 3-E training using code names.
 * Her current hair color was revealed to be dyed as shown in a flashback in Chapter 111.
 * When she was in first grade, she got 100% on 6th grade tests.
 * Despite the way she acts, whenever a perverted situation happens, she's shown to be completely disgusted.
 * During the Civil War, she was eliminated along with Terasaka, Yoshida and Muramatsu after Nagisa ambushed and shot all 4 of them.