Megumi Toyoguchi plays as Hikari (voice) in That Time I Got Reincarnated as a Slime.
Megumi Toyoguchi is the top #1 member of the cast and appears in 236 episodes.

Takaya Hashi (土師 孝也 Hashi Takaya, born September 8, 1952) is a veteran Japanese voice actor and actor affiliated with Apte Pro. His real name is Takaya Katō (加藤 孝也 Katō Takaya).

Takaya Hashi plays as Vearn (voice) in That Time I Got Reincarnated as a Slime.
Takaya Hashi is the top #2 member of the cast and appears in 94 episodes.

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 That Time I Got Reincarnated as a Slime.
Mao Ichimichi is the top #3 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 That Time I Got Reincarnated as a Slime.
Kazuya Nakai is the top #4 member of the cast and appears in 48 episodes.

Kenjiro Tsuda (津田 健次郎, Tsuda Kenjirō) is a Japanese voice actor, stage actor, and narrator affiliated with Amuleto and Stardust Promotion.

Kenjiro Tsuda plays as Takuya Gotou (voice) in That Time I Got Reincarnated as a Slime.
Kenjiro Tsuda is the top #5 member of the cast and appears in 26 episodes.

Haruki Ishiya (石谷 春貴, Ishiya Haruki, January 14, 1992) is a Japanese voice actor born in the city of Nobeoka, Miyazaki Prefecture, Japan. He is affiliated with Office Osawa. Formerly, he was affiliated with Pro-Fit.

Haruki Ishiya plays as Shuuichi Tsukamoto (voice) in That Time I Got Reincarnated as a Slime.
Haruki Ishiya is the top #6 member of the cast and appears in 26 episodes.

Rina Hidaka (日高 里菜, Hidaka Rina, born June 15, 1994) is a Japanese actress and voice actress from Chiba Prefecture. She is affiliated with Office Osawa, having been previously with AT Production.

Rina Hidaka plays as Arisu Sakayanagi (voice) in That Time I Got Reincarnated as a Slime.
Rina Hidaka is the top #7 member of the cast and appears in 25 episodes.

Hochu Otsuka (大塚 芳忠, Ōtsuka Hōchū, born Yoshitada Ōtsuka [same kanji], May 19, 1954) is a Japanese voice actor and narrator affiliated with the talent management firm Crazy Box. He is best known for his roles as the voices of Kyao Mirao in Heavy Metal L-Gaim; Yazan Gable in Mobile Suit Zeta Gundam; Akira Sendō in Slam Dunk; SignalMan in Gekisou Sentai Carranger; Imagin, Deneb in Kamen Rider Den-O, Abuto in Gintama, Makoto Sōda in Captain Tsubasa and Jiraiya in Naruto. He is also the famous official dubbing roles for Jean-Claude Van Damme, Donnie Yen (especially in Ip Man series), Jeff Goldblum, Ray Liotta, Tim Robbins, John C. McGinley, Brent Spiner, Kiefer Sutherland, Robert Patrick and many more.

Hochu Otsuka plays as Ziggy (voice) in That Time I Got Reincarnated as a Slime.
Hochu Otsuka is the top #8 member of the cast and appears in 25 episodes.

Takuya Eguchi is a Japanese voice actor and singer from Setagaya, Tokyo. He is affiliated with 81 Produce. He has voiced in a number of lead roles in anime shows including Kazuya Kujo in Gosick, Yoshiharu Sagara in The Ambition of Oda Nobuna, Kon Hokaze in Ixion Saga DT, Hachiman Hikigaya in My Youth Romantic Comedy Is Wrong, As I Expected, William Twining in Devils and Realist, Takeo Gōda in My Love Story. He won Best New Actor award at the 6th Seiyu Awards, and Best Voice Actor in the Newtype Anime Awards 2015. In 2017, Eguchi launched a manga about his life called Eguchi Takuya no Gainen Planet, to be published on Kadokawa's Dengeki Girl's Style Online website.

Takuya Eguchi plays as Shuji Hanma (voice) in That Time I Got Reincarnated as a Slime.
Takuya Eguchi is the top #9 member of the cast and appears in 24 episodes.

Chikahiro Kobayashi (小林 親弘, Kobayashi Chikahiro, September 5, 1983) is a Japanese actor and voice actor born in Aichi Prefecture, currently affiliated with Enkikaku.

Chikahiro Kobayashi plays as Tatsuya Fukuda (voice) in That Time I Got Reincarnated as a Slime.
Chikahiro Kobayashi is the top #10 member of the cast and appears in 24 episodes.