Tomoaki Maeno (36)

White Blood Cell U-1146 (Neutrophil) (voice)

Kana Hanazawa (29)

Red Blood Cell AE3803 (Erythrocyte) (voice)

Maria Naganawa (23)

Platelet 'Leader' (voice)

Akinori Egoshi (30)

White Blood Cell U-2001 (Neutrophil) (voice), Killer T Cell Squad Member (voice), Sweat Gland Cell Captain (voice)

Daisuke Ono (40)

Killer T Cell (voice)

Kikuko Inoue (54)

Macrophage (voice)

Takahiro Sakurai (44)

Helper T Cell (voice)

Saori Hayami (27)

Regulatory T Cell (voice)

Kentaro Kumagai (24)

White Blood Cell U-4989 (Neutrophil) (voice)

Mamiko Noto (38)

Narration (voice)

Yuka Nukui

Macrophage 1 (voice), Sweat Gland Cell 1 (voice)

Manaka Iwami (20)

Platelet 'Backwards Cap' (voice)

Toa Yukinari (30)

NK Cell (voice)

Nobuhiko Okamoto (32)

Dendritic Cell (voice)

Aya Endo (38)

Senior Red Blood Cell AA5100 (voice)

Kensuke Sato (40)

White Blood Cell U-2048 (Neutrophil) (voice)

Junichi Yanagita (31)

White Blood Cell U-2626 (Neutrophil) (voice)

Shoya Chiba (23)

B Cell (voice)

Kenji Nomura (48)

Effector T Cell (voice)

Mao Ichimichi (26)

Eosinophil (voice)

Tomokazu Sugita (38)

Basophil (voice)

Ayako Kawasumi (42)

Mast Cell (voice)

Shota Yamamoto

Killer T Cell 2 (voice)

Ryota Suzuki (20)

Killer T Cell 3 (voice)

Chiaki Kobayashi (24)

Killer T Cell 1 (voice)

Juri Kimura (30)

Macrophage 2 (voice)

Yusuke Kobayashi (33)

Ordinary Cell 1 (voice)

Makoto Furukawa (29)

Rhinovirus (voice)

Rie Kawamura

Female Sweat Gland Cell 2 (voice)

Gakuto Kajiwara (24)

Male Sweat Gland Cell 1 / Male Sweat Gland Cell 3 / Male Red Blood Cell 8 (voice)