Recurring Roles. Hiromi Shiota voiced by Caitlin Glass and 1 other. Nagisa Shiota voiced by Lindsay Seidel and 1 other. Matsukata voiced by R Bruce Elliott and 1 other. Assassination Classroom Assassination Classroom (暗殺教室 Ansatsu Kyōshitsu) is a Japanese manga written and illustrated by Yūsei Matsui that has appeared in Shueisha’s Weekly Shōnen Jump magazine from July 2012 to March 2016. Main Assassination Classroom Cast. TV Show: Assassination Classroom ... Sakura Kiyashiki voiced by Jill Harris and 1 other. Now he has too help kill Koro or the world is done for, through there is far more to this story them meets the eye. Assassination Classroom Assistant by Shadow Knight Destroyer reviews Having a dark past but strives for a bright future. Sakura Kiyashiki Jill Harris is the English dub voice of Sakura Kiyashiki in Assassination Classroom, and Hibiku Yamamura is the Japanese voice. Korosensei voiced by Sonny Strait and 2 others. Called the greatest assassin in his generation, nicknamed "The True Reaper".