|Birthday||June 12 (Gemini)|
|Height||161 cm (5'3")|
|Weight||51 kg (112 lbs)|
Brave Kimura (younger brother)
|School||Kunugigaoka Junior High School|
|Japanese Voice||Shunsuke Kawabe (Anime)|
Tomohiro Yamaguchi (OVA)
|English Voice||Jean-Luc Hester (Funimation Broadcast Dub)|
Masayoshi has dark brownish green hair which spikes up in many ridges ending in a triangular tip and black eyes.
Kimura is one of the relatively proactive students when it comes to assassination and aims to claim the 10 billion yen reward.
It is stated that both of his parents are police officers, and they have a high sense of justice, thus earn him "Justice" as a name.Even if he doesn't like the name and asks them to change it. He was constantly being teased about his first name being “Justice,” and his concentration dropped. As a result, his grades suffered and he was sent to Class E.
He is the main focus of chapter 89:Name Time. Although it is spelled with the general spelling for "Masayoshi", it actually reads as "Seigi" (which means Justice). He hates his own name because people would pick on him because of said name. Kirara Hazama also mentioned that she dislikes her name, while Karma Akabane mentions that he likes his. Korosensei then mentioned that Tadaomi Karasuma and Irina Jelavić both refused to say his name, resorting in them having a day which all of them used code names, and they are forbidden from using their real names for the rest of day.
At that point, a mock assassination is done with Mr. Karasuma as their target, in which everyone used code names to call each other. Once Ryūnosuke Chiba snipes Karasuma (in which he blocks with a piece of wood), they call upon Kimura to finish him off.
After the mock assassination, Kimura still had doubts about his name. Korosensei mentions that he could change his name if he wanted to, but stated that "Justice" was a better name if he happened to kill Korosensei later on. This makes Kimura think twice about changing his own name, at least until they happen to kill Korosensei.
Running: Kimura has been stated to be the fastest runner in class E.
Mobility: Kimura is considered one of the most adept students at free-running. He was part of the team responsible for distracting Karasuma-sensei during the game of cops and robbers.
- His favorite subject is Physical Education while his least favorite subject is Math.
- His hobby/specialty is running 100-meter dash in 11 seconds.
- Another of his hobbies is collecting autographs.
- His favorite food is Homemade Curry.
- His past club before dropping to Class E was Track Club.
- He was the only one without a codename during Class E's day with them. Instead Korosensei made the class refer to him as "Justice" which is his real name.
- He has a crush on Kurahashi.
- He's prone to colds.
- During the Civil War, he and Okano were both eliminated after both swung into a net trap behind Hara, subsequently knived by Maehara.
- In the tankobon extras, his statistics were listed as:
- Physical strength: 4
- Mobility: 5
- Close-range assassination: 4
- Long-range assassination: 1
- Academic ability: 1.5
- Characteristic skill: 5 (supreme runner)
|Kunugigaoka Junior High School|
|Faculty||Korosensei • Tadaomi Karasuma • Irina Jelavić• Aguri Yukimura|
|Students||Masayoshi Kimura • Hinano Kurahashi • Yūma Isogai • Hinata Okano • Hiroto Maehara • Megu Kataoka • Kōtarō Takebayashi • Tōka Yada • Kōki Mimura • Rio Nakamura • Nagisa Shiota • Kaede Kayano • Taisei Yoshida • Yukiko Kanzaki • Taiga Okajima • Rinka Hayami • Tomohito Sugino • Yuzuki Fuwa • Takuya Muramatsu • Kirara Hazama • Ryūnosuke Chiba • Manami Okuda • Sōsuke Sugaya • Sumire Hara • Ryōma Terasaka • Karma Akabane • Itona Horibe • Ritsu|
|Faculty||Gakuhō Asano • Kiyoshi Terai|
|Students||Tomoya Seo • Teppei Araki • Natsuhiko Koyama • Ren Sakakibara • Gakushū Asano • Kaho Tsuchiya • Kazutaka Shindō • Kokona Tagawa • Nobuta Tanaka • Chousuke Takada|