OVA
Description
Rimuru Tempest began as Satoru Mikami, a 37-year-old Japanese salaryman stabbed while saving a colleague. His dying random wishes were interpreted as skill requests by the Voice of the World, triggering reincarnation as a slime in a fantasy realm. Upon awakening, Rimuru possessed the Unique Skill Predator for absorption and mimicry, alongside Great Sage, an analytical intelligence providing cognitive support. Soon after, Rimuru met the sealed Storm Dragon Veldora Tempest. Exchanging names—Rimuru gaining his identity and Veldora receiving the surname Tempest—forged a lifelong bond. Rimuru consumed Veldora’s prison to analyze and eventually break the seal, temporarily housing the dragon within his body.
Rimuru’s physical form underwent significant evolution. Starting as a 40 cm diameter blue-translucent sphere, the slime form grew to 70-80 cm as a Demon Slime and reached 80-100 cm as an Ultimate Slime. Absorbing Shizue Izawa’s remains granted a humanoid form resembling her but androgynous, initially appearing as a 120 cm child. This form matured: 125-130 cm as a Demon Lord Seed, 135-140 cm as a True Demon Lord, and stabilized at 155 cm as an Ultimate Slime, featuring silver-blue hair, golden eyes, and increasingly refined features. The author confirms Rimuru is biologically genderless and sexless, with a neutral gender identity. While early translations used male pronouns reflecting Satoru’s past, official lore clarifies Rimuru as neither male nor female.
Core abilities expanded through evolution and assimilation. Predator advanced to Gluttony after consuming the Orc Lord’s Starved skill, then to Beelzebuth upon Rimuru’s ascension to True Demon Lord, enabling soul absorption. Great Sage evolved into the Ultimate Skill Raphael for enhanced analysis and skill management, later developing a separate personality, Ciel. Mimicry allowed shape-shifting, including wing generation and armor formation, while Degenerate facilitated skill fusion, creating techniques like Black Flame. Strategic abilities included Megiddo, a solar-based attack with environmental limitations, and wide-range magic such as Poison Gas and Icicle Lance. Post-Demon Lord evolution granted immortality and a tenfold increase in magicules.
Rimuru’s personality blends Satoru’s human experiences with pragmatic leadership. They prioritize creating a comfortable world where all beings coexist peacefully, driven by ideals backed by power. Typically laid-back and diplomatic, Rimuru avoids conflict through negotiation and empathy, forgiving former enemies like the orcs. However, threats to subordinates or allies trigger ruthless retaliation, exemplified by torturing Clayman or annihilating the Falmuth army. Rimuru exhibits shrewdness in statecraft, manipulating records and employing memory erasure to maintain Tempest’s benevolent image. Despite immense power, they delegate responsibilities, trusting allies like Benimaru and Shion.
As a leader, Rimuru founded the Jura Tempest Federation in the Great Forest of Jura, establishing a monster nation promoting interspecies equality. Naming monsters like the ogres and goblins triggered their evolution, inadvertently creating a powerful lineage connected to Rimuru’s soul. Following the Falmuth Kingdom’s attack, which caused mass casualties including Shion, Rimuru performed a ritual sacrificing 10,000 human souls to ascend as a True Demon Lord, reviving fallen comrades. This ascension solidified their position within the Octagram, the council of elite Demon Lords. Rimuru later reincarnated as an Ultimate Slime after merging with Veldora and the True Dragon core. Under Rimuru’s rule, Tempest became an economic and political hub, leveraging knowledge from Earth for innovations like manga and bathhouses while forming alliances with human nations.
Rimuru’s physical form underwent significant evolution. Starting as a 40 cm diameter blue-translucent sphere, the slime form grew to 70-80 cm as a Demon Slime and reached 80-100 cm as an Ultimate Slime. Absorbing Shizue Izawa’s remains granted a humanoid form resembling her but androgynous, initially appearing as a 120 cm child. This form matured: 125-130 cm as a Demon Lord Seed, 135-140 cm as a True Demon Lord, and stabilized at 155 cm as an Ultimate Slime, featuring silver-blue hair, golden eyes, and increasingly refined features. The author confirms Rimuru is biologically genderless and sexless, with a neutral gender identity. While early translations used male pronouns reflecting Satoru’s past, official lore clarifies Rimuru as neither male nor female.
Core abilities expanded through evolution and assimilation. Predator advanced to Gluttony after consuming the Orc Lord’s Starved skill, then to Beelzebuth upon Rimuru’s ascension to True Demon Lord, enabling soul absorption. Great Sage evolved into the Ultimate Skill Raphael for enhanced analysis and skill management, later developing a separate personality, Ciel. Mimicry allowed shape-shifting, including wing generation and armor formation, while Degenerate facilitated skill fusion, creating techniques like Black Flame. Strategic abilities included Megiddo, a solar-based attack with environmental limitations, and wide-range magic such as Poison Gas and Icicle Lance. Post-Demon Lord evolution granted immortality and a tenfold increase in magicules.
Rimuru’s personality blends Satoru’s human experiences with pragmatic leadership. They prioritize creating a comfortable world where all beings coexist peacefully, driven by ideals backed by power. Typically laid-back and diplomatic, Rimuru avoids conflict through negotiation and empathy, forgiving former enemies like the orcs. However, threats to subordinates or allies trigger ruthless retaliation, exemplified by torturing Clayman or annihilating the Falmuth army. Rimuru exhibits shrewdness in statecraft, manipulating records and employing memory erasure to maintain Tempest’s benevolent image. Despite immense power, they delegate responsibilities, trusting allies like Benimaru and Shion.
As a leader, Rimuru founded the Jura Tempest Federation in the Great Forest of Jura, establishing a monster nation promoting interspecies equality. Naming monsters like the ogres and goblins triggered their evolution, inadvertently creating a powerful lineage connected to Rimuru’s soul. Following the Falmuth Kingdom’s attack, which caused mass casualties including Shion, Rimuru performed a ritual sacrificing 10,000 human souls to ascend as a True Demon Lord, reviving fallen comrades. This ascension solidified their position within the Octagram, the council of elite Demon Lords. Rimuru later reincarnated as an Ultimate Slime after merging with Veldora and the True Dragon core. Under Rimuru’s rule, Tempest became an economic and political hub, leveraging knowledge from Earth for innovations like manga and bathhouses while forming alliances with human nations.