
Benimaru, the Flame Spirit Oni from That Time I Got Reincarnated as a Slime, has scorched millions with his Black Flame mastery, unyielding loyalty to Rimuru, and commanding presence as the Minister of Defense. From vengeful ogre survivor to Kijin General, Benimaru embodies disciplined fury in Tempest’s ranks.
Who is Nobimaru?
Nobimaru (紅丸) is a major supporting character in Fuse’s That Time I Got Reincarnated as a Slime (manga 2015–present, anime 2018–present). Introduced in chapter 12 and episode 5, he’s the eldest son of the Ogre Chieftain, evolving into a Kijin after being named by Rimuru.
Benimaru Wiki
| Full Name | Nobimaru |
| Nickname / Alias | Flare Lord, Crimson Ogre, Tempest’s General |
| Age | ~20s (pre-naming), ~30 (2025, post-Demon Lord ascension) |
| Gender | Male |
| Friends | Shikamaru Nara |
| Blood Type | Unknown |
| Species | Ogre → Kijin → Flame Spirit Oni |
| Family Members | Shuna (sister), Souei, Hakurou, Shion (ogre survivors), Rimuru (lord) |
Physical Appearance
| Height | 180 cm (~5’11”) |
| Weight | Unknown |
| Hair Color | Red |
| Eye Color | Red |
| Skin Color | Fair (horns, lean build) |
Warrior & Commander Career
| Occupation / Role | Minister of Defense, Kijin General, Commander of Tempest Army |
| Team | Rimuru’s Executive (Diablo, Zegion, etc.), Kijin Squad (Souei, Shuna) |
| Mentor / Teacher | Hakurou (swordsmanship), Rimuru (strategy) |
| Affiliation(s) | Jura Tempest Federation, Octagram (ally) |
| Status (2025) | Alive, leading Tempest’s forces against Eastern Empire threats |
| Debut (Anime) | Episode 5 (2018) |
| Debut (Manga) | Chapter 12 (2015) |
| Voice Actor (JP) | Yoshitsugu Matsuoka |
| Voice Actor (EN) | Chris Rager |
Powers & Combat Profile
| Species Ability | Fire Manipulation (Black Flame, Hell Flare), Superhuman Strength |
| Signature Move | Blazing Sun Lord Amaterasu (nihility destruction), Black Lightning |
| Ultimate Skill | Flare Lord (heat/light control, energy absorption) |
| Notable Battles | vs Orc Lord, vs Clayman, vs Velgrynd, vs Eastern Empire forces |
Social Media Presence
- X (Twitter) Fan Account: @FlareLordBenimaru
- Reddit: r/TenseiSlime
- TikTok: #Benimaru
Nobimaru Story
As the Ogre Chieftain’s heir, Nobimaru survives the Orc Disaster that wipes his village, vowing vengeance. Rescued by Rimuru, he’s named and evolves into a Kijin, becoming the military commander of Tempest.
His inferno:
- Orc Invasion: Leads survivors, evolves under Rimuru’s naming.
- Falmuth War: Commands army, performs Hell Flare to turn tide.
- Demon Lord Ascension: Fights alongside Rimuru vs Walpurgis threats.
- Eastern Empire Arc (2025): Flare Lord activation, clashes with Velgrynd and imperial forces.
Nobimaru’s oath: “I’ll burn any threat to Tempest… for my lord.”
Powers and Abilities
Nobimaru channels flame as fate:
- Black Flame – Nihility attribute fire; burns energy/souls, absorbs for growth.
- Hell Flare: Devastating black flame dragon — vaporizes armies.
- Blazing Sun Lord Amaterasu: Ultimate nihility — destroys concepts, controls heat/light.
- Swordsmanship – Master blade work, enhanced by Hakurou; fights Dragon-class foes.
- Leadership Aura – Commands legions, boosts allies’ morale/power.
- Evolution Boost – Kijin from ogre; potential Spirit Oni form unlocked post-2025 battles.
Example: vs Velgrynd — Amaterasu counters infinite acceleration, nearly sealing the True Dragon.
Personality Traits
Nobimaru is calm, cunning, and battle-hungry:
- Hot-Headed Heir – Early rage tempered by Rimuru’s wisdom.
- Protective Brother – Shields Shuna fiercely, dotes subtly.
- Strategic Beast – Prefers overwhelming force over subtlety; loves worthy foes.
- Loyal Flame – Absolute devotion to Rimuru; “My life is yours.”
Nobimaru Quotes
- “My flames will consume all who threaten Lord Rimuru.”
- “Victory isn’t in strength alone… it’s in the will to fight for what matters.”
- “Hell Flare… ignite!”
- “Oni don’t kneel… we rise.”
Popular Fan Theories
Hot in :
- Benimaru’s Ultimate Form: Flame Spirit Oni — full awakening vs. Eastern Empire.
- Shuna Romance: Subtle hints of sibling-like bond evolving? (Debunked — platonic).
- Benimaru vs. Guy Crimson: Benimaru wins with Amaterasu (fan calc).
- LN Vol. 22: Incoming Benimaru solo chapter on fire evolution.
Unknown or Fun Facts about Nobimaru
- Horn Sensitivity: Glowing obsidian horns — channel fire, but ticklish when touched.
- Sword Name: Unnamed katana — forged from ogre village remnants.
- Voice Actor: Yoshitsugu Matsuoka also voices Kirito (SAO).
- Weakness: Overconfidence — underestimates “weak” foes occasionally.
FAQs
Q1. Who is Nobimaru in Slime?
Kijin general, Rimuru’s military commander, Shuna’s brother
Q2. What is Nobimaru’s power?
Black Flame — nihility fire, absorbs energy, destroys souls.
Q3. Is Nobimaru stronger than Shion?
Yes — better in leadership/combat; Shion edges in raw strength.
Q4. What is Nobimaru’s height and species?
Height: 180 cm (~5’11”) | Species: Flame Spirit Oni.





