Ryoma Terasaka

Ryōma Terasaka is a student in Korosensei's Class 3-E in Kunugigaoka Junior High School.

Appearance
Terasaka has short, spiky, black hair which is dyed blonde around the sides. He has a bulky body which he uses to intimidate people with and light eyes (green in the anime).

Personality
Terasaka is a former bully who enjoyed picking on people because of his large build and loud voice. He is rather dim-witted and relies on others to make plans for him to follow which makes it very easy for others to manipulate him. In addition he is also quick to anger and is very lazy which is why he's in Class E. He disliked Korosensei and how extraordinary Class E was becoming unlike how it used to be (which was a boring and depressing place). Though he acts as if he doesn't, he cares a lot about his classmates and was extremely disturbed when Shiro put them in danger.

After the incident with Shiro, Terasaka is much nicer and no longer bullies others. He often gives encouraging advice to other characters when they need it most and has acknowledge Class E as a place full with amazing and capable people. Despite this development he is still hotheaded and slow-minded, but not as much compared to the beginning of the manga.

History
Rather than using his brains and wit to succeed in life, Terasaka relied on his strong build and loud voice to use others to his advantage. This also meant that he could bully others into submission with ease and it is implied that he also made them do his work for them, which was probably how he got into Kunugigaoka Junior High in the first place.

Upon being admitted into the school he was put in the same class as Natsuhiko Koyama, who would eventually become one of the top five scorers in the school. Though Terasaka initially attempted to persuade the hard-worker into submission, he soon found that the school, which was so focused on grades, would make his bullying ways obsolete and soon found himself in Class 3-E as a result of his poor academic skills.

Though Class 3-E was a very depressing place, Terasaka was perfectly fine with it because it meant he would not have to work hard and could just cruise through his school life without doing much (if any) work. However that all changed when Korosensei appeared and the entire class was soon drawn into the prospect of assassination and thus greatly encouraging them which did not sit well with Terasaka at first.

Plot
Terasaka is introduced in Chapter 1 like the rest of the class. After the class's first failed attempt to collectively kill Korosensei, he and his two friends Takuya Muramatsu and Taisei Yoshida pressured fellow classmate Nagisa Shiota into carrying out their plan. Terasaka made Nagisa into a suicide bomber of sorts when the latter falls onto Korosensei with a toy grenade filled with anti sensei BBs inside around Nagisa's neck, which Terasaka then remotely detonated. However, Nagisa was unharmed by Korosensei's shedded skin, with the teacher himself very pissed that Terasaka pulled such a stunt. To make him and the class fully understand the ramifications of such an act, Korosensei grabbed all of their family nameplates from their houses, stating that while he cannot harm the students, no condition was made to hurt their families or destroy the whole world but them. Although very scared by this, Terasaka argues back stating that an annoying being like Korosensei has to be killed by any means necessary to defend themselves, which puts Korosensei back into a good mood. While he commended the plan and Nagisa's execution of it, the fact that Terasaka and his friends did not care for Nagisa's well-being means that they cannot be called assassins.

Since then, Terasaka mainly stayed out of or did not assist his other classmates' assassination attempts. As time passed on and the students grew more friendlier with their teacher, Terasaka became increasing isolated. He gets a major spotlight in the Summertime Arc, where his isolation from the class and increasing irritation at Korosensei came to a head. Wanting things to return as it did before Korosensei's arrival, Terasaka disrupted his classmates' fun and helps Shiro and Itona in preparing their next plan, smashing a can of smoke inside the school classroom and contaminating the newly-created pool to hamper Korosensei's abilities. When Shiro's plan is completely prepared, Terasaka orders the reluctant class to help him kill the teacher at the pool. But when Terasaka unknowingly blows up the pool's dam and putting the students in the pool in danger of being killed, he realizes he'd been manipulated by Shiro, and thus helps Karma defeat Shiro and Itona's plan.

Abilities
Strength: One of Terasaka's more noticeable features is his physical strength. This has been noted by both Karasuma and Itona.

Durability: Out of all the students of Class E, his durability is among the highest, if not the highest. He has been shown to be able to withstand direct attacks from Itona's tentacles and was able to hide his poison symptoms for hours during the Assassination Island arc.

Itona Horibe
Itona and Terasaka are good friends despite the former continuously calling the latter stupid and idiotic. Terasaka is the one who managed to open Itona's heart and convince him to change his ways. After Itona reforms and becomes an official student of Class E, he joins Terasaka's group.

Karma Akabane
Originally, Terasaka and Karma did not get along. Karma considered Terasaka was a clueless and Terasaka disliked Karma's high and mighty attitude. When Shiro deceived and betrayed Terasaka, the latter relied on Karma to help him showing that he acknowledges his intelligence and guile. Now, the two get along a lot better although Karma's original perception of Terasaka being an idiot has not changed.

Takuya Muramatsu
During the Assassination Test of Courage, Korosensei paired Ryōma with Takuya and Kirara. Most of the times, he is often hanging out with Terasaka.

Kirara Hazama
During the Assassination Test of Courage, Korosensei paired Ryōma with Takuya and Kirara. Most of the times, she is often hanging out with Terasaka.

Taisei Yoshida
Most of the times, he is often hanging out with Terasaka.

Quotes
(To Itona Horibe) "It's fine if you fail 100 times. Until March, if we kill him just once... Just with that, it's our win."

Trivia

 * His best subject is P.E., and his worse is everything else.
 * His aspiration is to be political.
 * His treasure are his friends.
 * His favorite food is bowl of rice with beef.
 * According to his profile, Terasaka blood type is O-.
 * He was called "Pseudo-Takaoka" during class 3-E training using code names. This possibly stems from fans noting the resemblance between Takaoka and Terasaka.
 * He got 46th place in the latest exam (chapter 123).
 * During the Civil War, he was eliminated along with Nakamura, Yoshida and Muramatsu when Nagisa ambushed and shot all 4 of them.