Assassination Cast
This is just the cast of Characters and their roles of who they will play and I revise again.
Disclaimers: I own nothing
Class 3-E
Males
Nagisa Shiota
Karma Akabane
Yuma Isogai
Hiroto Maehara
Sosuke Sugaya
Ryunosuke Chiba
Takuya Muramatsu
Ryoma Terasaka
Taisei Yoshida
Tomohito Sugino
Masayoshi/Justice Kimura
Taiga Okajima
Kotaro Takebayashi
Koki Mimura
Itona Horibe
Females
Hinata Okano
Meg Kataoka
Toka Yada
Hinano Kurahashi
Kirara Hazama
Minami Okuda
Rio Nakamura
Rinka Hayami
Sumire Hara
Yuzuki Fuwa
Kaede Kayano/Akari Yukimura
Ritsu/AIFA
Yukiko Kanzaki
Teachers
Females
Irina Jelavic
Suzume Sonokawa
XXX
Males
Deathstroke/Slade Wilson (Arrow)-Nagisa Shiota
Black Manta/David (JL Flashpoint)-Karma Akabane
Firefly/Garfield Lynns (Arkham Origins)-Yuma Isogai
Killer Moth/Cameron Van Cheer (Bad Blood)-Hiroto Maehara
Arkham Knight/Jason Todd (Arkham Knight)-Sosuke Sugaya
Deadshot/Floyed Lawton (Suicide Squad 2016)-Ryunosuke Chiba
Killer Croc/Waylon Jones (Son of Batman)-Takuya Muramatsu
Bane/Dorrance (Injustice)-Ryoma Terasaka
King Shark/Shay Lamden (The Flash)-Taisei Yoshida
Dark Archer/Malcolm Merlyn (Arrow)-Tomohito Sugino
Reverse Flash/Eobard Thawne (JL Flashpoint)-Masayoshi/Justice Kimura
El Diablo/Chanto Santana (Suicide Squad 2016)-Taiga Okajima
Captain Boomerang/George "Digger" Harkness (Suicide Squad 2016)-Kotaro Takebayashi
Slipknot/Christopher Weiss (Suicide Squad 2016)-Koki Mimura
Females
Katana/Tatsu Yamashiro (Suicide Squad 2016)-Hinata Okano
Catwoman/Selina Kyle (Arkham Knight)-Meg Kataoka
Lady Shiva/Sandra Woosan (Arkham Origins)-Toka Yada
Poison Ivy/Pamela Lillian Isley (Arkham City)-Hinano Kurahashi
Enchantress/June Moore (Suicide Squad 2016)-Kirara Hazama
Doctor Poison/Isabel Marn (Wonder Woman 2017)-Minami Okuda
Ravager/Rose Wilson (Deathstroke Vol 1 Gods of War)-Rio Nakamura
Harley Quinn/Harley Quinzel (Suicide Squad 2016)-Rinka Hayami
Nyssa Al Gul/Nyssa Raatko (Arrow)-Sumire Hara
Cheshire/Jade Nguyen (Young Justice)-Yuzuki Fuwa
Zahlenschwestern
Acht (Phantom: Requiem for the Phantom)-Kaede Kayano/Akari Yukimura
Neun (Phantom: Requiem for the Phantom)-Ritsu/AIFA
Funf (Phantom: Requiem for the Phantom)-Yukiko Kanzaki
Vier (Phantom: Requiem for the Phantom)-Itona Horibe
If any of you don't remember Suzume Sonokawa, she was Karasuma assistant but she's has minor role in the actually anime. But in this fanfic she takes Karasuma's role as teacher.