Voice Actor for Rimuru Tempest in That Time I Got Reincarnated as a Slime? Miho Okasaki & Brittney Karbowski -

The Japanese voice actor for Rimuru Tempest in That Time I Got Reincarnated as a Slime is Miho Okasaki (岡咲美保). In the English dub, Rimuru is voiced by Brittney Karbowski. Okasaki’s energetic and emotionally expressive performance became one of the defining elements of the series, helping Rimuru balance lighthearted comedy, emotional warmth, and overwhelming power throughout the anime. (behindthevoiceactors.com)

Japanese Voice Actor: Miho Okasaki

Date of Birth

November 22, 1998. (en.wikipedia.org)

About Miho

Miho Okasaki is a Japanese voice actress and singer best known for her breakout role as Rimuru Tempest in That Time I Got Reincarnated as a Slime. Her portrayal became widely praised for capturing Rimuru’s approachable personality while still conveying the authority and emotional depth needed for the character’s later evolution into one of the most powerful beings in the series.

Rimuru was one of Okasaki’s earliest major lead roles, and its success helped launch her career in both voice acting and music. She later performed several theme songs connected to the franchise and expanded into additional anime, game, and live event work.

Outside of Slime, Okasaki is also known for roles in The Idolmaster Cinderella Girls, Onimai, and Goblin Slayer. (anime-planet.com)

Hometown

Okayama Prefecture, Japan. (en.wikipedia.org)

Career Highlights

Rimuru Tempest — That Time I Got Reincarnated as a Slime
Mari Iochi — The Idolmaster Cinderella Girls
Kuon — Onimai: I’m Now Your Sister!
Guild Girl’s sister roles and supporting appearances — Goblin Slayer
Rimuru Tempest — Isekai Memories
Rimuru Tempest — Isekai Quartet crossover appearances and promotions

Full Current Filmography

The following list reflects publicly documented anime and game credits from major databases and official publisher materials. It may not be exhaustive.

Television Anime

That Time I Got Reincarnated as a Slime — Rimuru Tempest (2018)
That Time I Got Reincarnated as a Slime Season 2 — Rimuru Tempest (2021)
That Time I Got Reincarnated as a Slime Season 3 — Rimuru Tempest (2024)
The Slime Diaries — Rimuru Tempest
The Idolmaster Cinderella Girls — Mari Iochi
Onimai: I’m Now Your Sister! — Kuon
Extreme Hearts — Michelle Jaeger
Selection Project — Rena Hananoi
Goblin Slayer — Supporting Roles
Music Girls — Additional Roles

Anime Films

That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond — Rimuru Tempest
That Time I Got Reincarnated as a Slime: Coleus’ Dream — Rimuru Tempest

Video Games

That Time I Got Reincarnated as a Slime: ISEKAI Memories — Rimuru Tempest
Azur Lane — Supporting Roles
The Idolmaster Cinderella Girls mobile games — Mari Iochi

Critical Reception

Miho Okasaki’s portrayal of Rimuru Tempest has been praised for making the character feel simultaneously powerful and approachable. Fans often point to her expressive comedic timing and emotional sincerity as major reasons Rimuru became one of modern isekai anime’s most beloved protagonists.

Critics also highlighted her ability to adapt the performance as Rimuru matured politically and emotionally across later seasons, especially during darker story arcs involving war, leadership, and sacrifice. Her performance helped establish Rimuru as a very different type of isekai lead compared to more stoic or aggressive protagonists. (cbr.com)

Our Sources

Behind The Voice Actors – Rimuru Tempest (https://www.behindthevoiceactors.com/characters/That-Time-I-Got-Reincarnated-as-a-Slime/Rimuru-Tempest/)

Wikipedia – Miho Okasaki (https://en.wikipedia.org/wiki/Miho_Okasaki)

Anime Planet – Miho Okasaki Profile (https://www.anime-planet.com/people/miho-okasaki)

IMDb – That Time I Got Reincarnated as a Slime Full Cast & Crew (https://www.imdb.com/title/tt9054364/fullcredits/)

Social Media

X / Twitter: https://x.com/okasakimiho_PR

Official Website: https://okasakimiho.com/

Instagram: https://www.instagram.com/okasakimiho_official/

English Voice Actor: Brittney Karbowski

Date of Birth

June 26, 1986. (behindthevoiceactors.com)

About Brittney

Brittney Karbowski is the English voice actor for Rimuru Tempest in the English dub of That Time I Got Reincarnated as a Slime. Her energetic and emotionally versatile performance became one of the most celebrated aspects of the dub adaptation, helping Rimuru maintain a balance between comedic charm, emotional sincerity, and overwhelming authority.

Karbowski’s naturally expressive vocal style made her especially well suited for Rimuru’s constantly shifting tone. Whether delivering playful banter, emotional speeches, or commanding battlefield moments, she helped make Rimuru feel approachable and charismatic throughout the series.

Outside of Slime, Karbowski is widely known for major anime roles in A Certain Scientific Railgun, Soul Eater, Angel Beats!, Fairy Tail, and One Piece. (imdb.com)

Hometown

Sugar Land, Texas, United States. (behindthevoiceactors.com)

Career Highlights

Rimuru Tempest — That Time I Got Reincarnated as a Slime
Mikoto Misaka — A Certain Scientific Railgun
Wendy Marvell — Fairy Tail
Black Star — Soul Eater
Yamada — B Gata H Kei
Camie Utsushimi — My Hero Academia
Yuri Nakamura — Angel Beats!
Pride — Fullmetal Alchemist: Brotherhood
Kyouko Toshinou — YuruYuri
Karen Tendou — Gamers! (behindthevoiceactors.com)

Full Current Filmography

The following list reflects publicly documented anime, dubbing, and game credits from major databases and official publisher materials. It may not be exhaustive.

Television Anime

That Time I Got Reincarnated as a Slime — Rimuru Tempest (2018)
That Time I Got Reincarnated as a Slime Season 2 — Rimuru Tempest (2021)
That Time I Got Reincarnated as a Slime Season 3 — Rimuru Tempest (2024)
The Slime Diaries — Rimuru Tempest
A Certain Scientific Railgun — Mikoto Misaka
Fairy Tail — Wendy Marvell
Soul Eater — Black Star
Angel Beats! — Yuri Nakamura
My Hero Academia — Camie Utsushimi
Fullmetal Alchemist: Brotherhood — Pride
One Piece — Apis and additional voices
Date A Live — Kotori Itsuka
Assassination Classroom — Kaede Kayano
Fire Force — Inca Kasugatani

Anime Films

That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond — Rimuru Tempest
Fullmetal Alchemist: The Sacred Star of Milos — Pride
My Hero Academia films — Camie Utsushimi
Fairy Tail: Dragon Cry — Wendy Marvell

Video Games

That Time I Got Reincarnated as a Slime: ISEKAI Memories — Rimuru Tempest
Borderlands 3 — Additional Voices
SMITE — Various Voice Roles
Paladins — Various Roles
BlazBlue series — Additional Voices

Critical Reception

Brittney Karbowski’s portrayal of Rimuru Tempest has received widespread praise among English dub fans for preserving the character’s warmth and humor while still conveying emotional maturity during serious story arcs.

Many viewers specifically highlight how naturally Karbowski handles Rimuru’s transition from carefree adventurer to nation-building leader. Her performance during emotionally heavier scenes in Season 2 earned particular acclaim, especially moments involving sacrifice, revenge, and political leadership. Fans frequently cite Rimuru as one of Karbowski’s signature anime performances. (behindthevoiceactors.com)