Full cast of Tonari no Seki-kun: The Master of Killing Time

Hiro Shimono

Toshinari Seki (voice)

21 episodes

Kana Hanazawa

Rumi Yokoi (voice)

21 episodes

Koji Yusa

Tani-sensei (voice)

7 episodes

Cocoro Kikuchi

Tomoka Hashino (voice)

7 episodes

Tetsuo Sakaguchi

Narration (voice)

6 episodes

Mami Shitara

Yu Nakamura (voice)

4 episodes

Jiro Saito

Adachi-sensei (voice)

4 episodes

Katsuya Shoji

Male Student A (voice) / Teacher A (voice)

4 episodes

Satomi Sato

Sakurako Goto (voice)

3 episodes

Tomoaki Ikeda

Science Teacher (voice) / PA Announcement (voice)

3 episodes

Minoru Shiraishi

Akiyasu Uzawa (voice)

2 episodes

Shigeyuki Susaki

Takahiro Maeda (voice)

2 episodes

Shin Goto

Japanese Teacher (voice)

2 episodes

Yuka Keicho

Observer (voice) / Robot Mother (voice)

2 episodes

Jin Yamanoi

Art Teacher (voice)

2 episodes

Atsushi Kisaichi

Mathematics Teacher (voice)

2 episodes

Shunji Kanemune

Male Student B (voice)

2 episodes

Kanji Obana

Gold General (voice)

1 episode

Ryo Kuratomi

King (voice)

1 episode

Kenta Matsumoto

Referee (voice)

1 episode

Toru Sakurai

Robot Father (voice)

1 episode

Marie Mizuno

Robot Boy (voice)

1 episode

Chinatsu Akasaki

Classmate (voice)

1 episode

Akari Harashima

Student (voice)

1 episode

Tarusuke Shingaki

PE Teacher (voice)

1 episode

Isamu Yusen

Male Student B (voice)

1 episode

Ikkyu Juku

Hobby Shop Owner (voice)

1 episode

Megumi Nasu

Music Teacher (voice)

1 episode

Seigo Yokota

Teacher B (voice)

1 episode

Miki Ito

Rumi's Mother (voice)

1 episode