Mao Ichimichi is a Japanese actress, voice actress and a former gravure idol. When she does voice acting she uses her moniker M·A·O. In 2011 she made her major acting debut in the role of Luka Millfy/Gokai Yellow in the Super Sentai series Kaizoku Sentai Gokaiger.

Mao Ichimichi plays as Iris (voice) in Fire Force.
Mao Ichimichi is the top #1 member of the cast and appears in 48 episodes.

Kazuya Nakai (中井 和哉, born November 25, 1967) is an award-winning Japanese voice actor and narrator who was born in Kobe, Japan. From a young age, he was interested in anime. Growing up he had interests like volleyball and archery. He was working as a civil servant in a technical field at 25 when he decided that's not how he wanted to live his life, so he enrolled into a voice acting school he attended on his days off and on weekends while still working. Despite starting his career as a narrator, he took off as a voice actor and became a big name when he got the role of Roronoa Zoro, a character he definitely wanted to voice. He narrates programs including information and news programs and voices many iconic characters such as Roronoa Zoro from One Piece, Toshiro Hijikata from Gintama, Date Masamune from Sengoku Basara, Mugen from Samurai Champloo and Jin Sakai in the Japanese dub of the video game Ghost of Tsushima. He loves driving, practicing archery and spending time with his dog and cat.

Kazuya Nakai plays as Akitaru Obi (voice) in Fire Force.
Kazuya Nakai is the top #2 member of the cast and appears in 48 episodes.

Kenichi Suzumura was born September 12, 1974 in Niigata, Japan and raised in Osaka. He is a voice actor and singer currently affiliated with Intention, which he is also the representative director of and formerly affiliated with Arts Vision. He made his television animation debut on Macross 7 in 1994. In addition to performing many different character songs in his voice acting career, Suzumura has become a singer signed under the Lantis label. As a solo artist he writes all his songs. In his debut year 2008, Suzumura also became one of the main hosts of the annual live music event Original Entertainment Paradise. He is married to fellow voice actress Maaya Sakamoto. Katsumi Aida, Takeshi Sonomura and Daisuke Takigawa are aliases Kenichi Suzumura used for adult work.

Kenichi Suzumura plays as Takehisa Hinawa (voice) in Fire Force.
Kenichi Suzumura is the top #3 member of the cast and appears in 48 episodes.

Daisuke Sakaguchi is a Japanese voice actor affiliated with Aoni Production.

Daisuke Sakaguchi plays as Victor Licht (voice) in Fire Force.
Daisuke Sakaguchi is the top #4 member of the cast and appears in 48 episodes.

Taku Yashiro is a Japanese voice actor affiliated with VIMS.

Taku Yashiro plays as Vulcan Joseph (voice) in Fire Force.
Taku Yashiro is the top #5 member of the cast and appears in 48 episodes.

Yusuke Kobayashi is a Japanese voice actor. He is affiliated with Yu-rin Pro. In 2017, he won the Best New Actor Award at the 11th Seiyu Awards. He was born in Tokyo, and is 1.64 m tall.

Yusuke Kobayashi plays as Arthur Boyle (voice) in Fire Force.
Yusuke Kobayashi is the top #6 member of the cast and appears in 48 episodes.

Saeko Kamijo (上條 沙恵子, Kamijō Saeko, born May 24, 1994) is a Japanese seiyū (voice actress) and stage actress from Nagano Prefecture. She belongs to Super Eccentric Theater.

Saeko Kamijo plays as Maki Oze (voice) in Fire Force.
Saeko Kamijo is the top #7 member of the cast and appears in 48 episodes.

Aoi Yuki (悠木 碧, Yūki Aoi, born March 27, 1992) is a Japanese voice actress (seiyuu), actress and singer from Sanmu City, Chiba Prefecture. She is affiliated with Aoni Production. Her real name and former stage name is Aoi Yabusaki (八武 崎碧, Yabusaki Aoi). She was previously affiliated with Breath and Pro Fit.

Aoi Yuki plays as Mami Nanami (voice) in Fire Force.
Aoi Yuki is the top #8 member of the cast and appears in 36 episodes.

Gakuto Kajiwara is a Japanese voice actor and singer from Osaka Prefecture. He is affiliated with Haikyō. He is best known for voicing Asta in Black Clover, Shinra Kusakabe in Fire Force, and Hitohito Tadano in Komi Can't Communicate, Luka in Honkai: Star Rail, and Hiiro Amagi in Ensemble Stars!. [Bio from Wikipedia]

Gakuto Kajiwara plays as Shun Kuribayashi (voice) in Fire Force.
Gakuto Kajiwara is the top #9 member of the cast and appears in 36 episodes.