- Cross-Dressing Voices: Rimuru is voiced by Miho Okazaki and Brittney Karbowski.
- Directed by Cast Member: The English Dub is directed by Yuuki's voice actor, Clifford Chapin.
- Relationship Voice Actor:
- Veldora, Shion, Benimaru, Rigur, Tranie, Kaijin and Gid are Isurugi, Julietta, Zack, Chad, Merribit, Nadi and Orliss
- Benimaru and Fuse are Diodora and Shalba
- Satoru and Bester are Jackal and Silver
- Shizue and Satoru are Nozomi and Clive
- Souei and Hakurou are Hien and Red Dragon
- Valdora, Tranie and Milim are Takeru, Demitra and Riru and Airiru
- Gabiru and Souei are Kazuma and Kyouya
- in the dub, Shion, Ramiris, and Treyni were once school idols.
- Rimuru and Shuuna are Koyomi and Yuu and Rin and Komari.
- Rimuru, Ramiris, Sousei, Shuuna, Shion, Gabiru, Leon, Clayman and Treyni are Wendy, Carla, Jackal, Happy, Seliah, Alzack, Mest/Doranbalt, Fried and Cana.
- Rimuru, Shuuna, Treyni, Ramiris and Shion are Kaguya Yamai, Yoshino, Ai, Miku Izayoi, and Tohka Yatogami.
- Rimuru, Gabiru, Yuuki, Shion, Ramiris, and Shizue are Mikoto Misaka, Accelerator, Shiage Hamazura, Bayloupe, Komoe, and Carissa.
- The Wiki Rule: the Tensei Shitara Slime datta ken Wiki.
Trivia / That Time I Got Reincarnated as a Slime