Sōsuke is a tall and slender male with light grey/silver hair that goes past his ears and dark/black small eyes.
Sugaya is a well-meaning and easy-going person who's also very creative. He has a love and talent for art and has a calm demeanor.
During his 2nd year, he was treated as a delinquent by teachers because his "needless" artistic tendencies ended up making him stand out too much. In the end, because of his art and his low grades, he was dropped to Class E.
Sugaya makes his debut when he amazed the class with a henna tattoo on his arm. Sugaya offers to draw a henna tattoo on Korosensei and he happily accepts. Part of Korosensei's face begins to melt, which prompted Sugaya to reveal that he had grounded anti-sensei material into the paint. After Korosensei compliments him for his idea, Sugaya apologizes and tells him he'll draw one with normal henna.
After a while, the whole class adopts Sugaya's henna style. After Irina trips and falls unconscious, Suguya and Korosensei take the opportunity to draw on her. He reflects on how he ended up in Class 3-E before finishing drawing on Irina.
Suguya participates in the class' fight with Gastro by creating a humanoid decoy. This decoy tricks Gastro long enough for Chiba to incapacitate the asssassin.
Artistry: Sugaya is the most artistic member of Class E. He's very creative when in comes to making things ranging from carvings, drawings and even paint. Because of his artistic sense, he's able to make disguises quickly and proficiently, along with designing camouflages for the Class E's assassination uniforms, crafting objects under silence, and sculpting smaller items to a expert degree.
- (To Nagisa Shiota) "In this class, even guys who are a bit unconventional are considered normal. This killing thing isn't so bad."
- His favorite subject is Art while his least favorite subject is Math.
- His hobby/specialty is touring art museums.
- His favorite food is Coriander.
- His past club before dropping to Class E was Art Club.
- He was called "Artsy Bean Pole" during class 3-E training using code names.
- He was paired with Rio Nakamura in Chapter 74 during Nuru-Nuru Test of Courage.
- He's the lowest ranked student of Class E on academics, being ranked 95th out of 186 students.
- In the art rankings of volume 5, he was placed 1st among the male students.
- During the Civil War, he was eliminated when Kanzaki busted his camouflage and shot him.
- In the tankobon extras, his statistics were listed as:
- Physical strength: 2.5
- Mobility: 2.5
- Close-range assassination: 3
- Long-range assassination: 3.5
- Academic ability: 1
- Characteristic skill: 5 (Fine arts)
- His school rankings are:
- First Term Midterms: 149th, 254 points
- First Term Finals: 95th, 338 points
- Second Term Midterms: 126th, 311 points
- Second Term Finals: 44th, 320 points
- Assassination Classroom manga; Chapter 37, pages 19
|Kunugigaoka Junior High School|
|Faculty||Korosensei • Tadaomi Karasuma • Irina Jelavić • Aguri Yukimura|
|Students||Masayoshi Kimura • Hinano Kurahashi • Yuma Isogai • Hinata Okano • Hiroto Maehara • Meg Kataoka • Kotaro Takebayashi • Toka Yada • Koki Mimura • Rio Nakamura • Nagisa Shiota • Kaede Kayano • Taisei Yoshida • Yukiko Kanzaki • Taiga Okajima • Rinka Hayami • Tomohito Sugino • Yuzuki Fuwa • Takuya Muramatsu • Kirara Hazama • Ryunosuke Chiba • Manami Okuda • Sosuke Sugaya • Sumire Hara • Ryōma Terasaka • Karma Akabane • Itona Horibe • Ritsu|
|Faculty||Gakuho Asano • Kiyoshi Terai|
|Students||Tomoya Seo • Teppei Araki • Natsuhiko Koyama • Ren Sakakibara • Gakushu Asano • Kaho Tsuchiya • Kazutaka Shindō • Kokona Tagawa • Nobuta Tanaka • Chousuke Takada|