Strongest That Time I Got Reincarnated as a Slime Characters, Ranked

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The strongest characters in That Time I Got Reincarnated as a Slime stop being a simple “who hits harder” debate once the story reaches the late-light-novel stage. By volumes 22 and 23, Fuse has pushed the series into endgame territory, where True Dragons, ancient angels, and world-destroying beings define the scale of the world far more than the early village-building days ever did. 

What started as a humble story about a salaryman becoming a blue blob has evolved into a cosmic epic where characters can delete universes and rewrite the laws of physics. As we approach the final chapters of the Light Novel and the peak of the Tenma War, the hierarchy of power is no longer about who has the biggest fireball. It is about who has the most sophisticated “Manas” or Ultimate Skill. 

In this list, we look at the absolute titans of the That Time I Got Reincarnated as a Slime universe. From the Primordial Demons to the True Dragons and the Creator God himself, these are the fifteen individuals who stand at the summit of existence:

15 Zegion is the Insectar King and Rimuru’s Absolute Loyalist

Zegion started as a small beetle but, thanks to Rimuru’s cells and intense training under Veldora, he evolved into the “Mist Lord.” He is a melee combat specialist who uses a combination of water-based attacks and space manipulation. His exoskeleton is made of “God-Grade” equipment, and his Ultimate Skill, “Mephisto,” allows him to turn his enemies’ illusions against them.

Zegion is so powerful that he can easily defeat several Demon Lord-level threats simultaneously without breaking a sweat. He is the guardian of the 100th floor of the Labyrinth and remains the strongest of Rimuru’s “Twelve Patrons,” standing as a wall no intruder can pass.

14 Diablo is a Primordial Demon With Infinite Resurrection

Diablo is the “Noir” of the Primordial Demons and Rimuru’s most loyal subordinate. While he might not have the raw magicule count of a True Dragon, he is arguably the most terrifying character to fight. Diablo has perfected “Instant Resurrection,” meaning that even if you destroy his body and soul, he will manifest back into existence a second later.

His Ultimate Skill, “Azazel,” gives him absolute control over the laws of the world within his “Temptation World.” Diablo’s combat genius and his refusal to stay dead make him an opponent that even the strongest beings on this list would rather avoid at all costs.

13 Dagruel is a Giant Deity With Magic-Cancelling Defense

Dagruel, the “Earthquake Lord,” is a unique existence who doesn’t even need an Ultimate Skill to be a top-tier threat. As a giant, his body naturally nullifies magic, making him the natural enemy of any caster. When he merges with his brothers to become the three-headed deity “Ashura,” his power rivals that of a True Dragon.

He was able to fight Veldora to a standstill in the past, and his physical strikes can shatter reality. Dagruel represents the sheer power of the earth itself, and his “Hardness” is legendary. He is one of the few characters who can ignore the complex laws of magic through sheer mass.

12 Chloe Aubert Masters Time Paradoxes as the Ultimate Hero

Chloe Aubert is the “True Hero” and perhaps the most skilled swordsman in existence. Due to a complex time-travel loop, Chloe has lived through countless lifetimes, honing her skills and accumulating power. Her Ultimate Skill, “Yog-Sothoth,” allows her to manipulate time and space on a level that rivals the True Dragons. 

She can stop time, see into the future, and even exist outside of the normal flow of causality. In a direct duel, her mastery of the blade is so great that even Guy Crimson views her as a legitimate threat. She is the ultimate deterrent against the forces of darkness.

11 Velgrynd Strikes With the Speed of the Flame God Cthugha

Velgrynd, the “Scorch Dragon,” is the master of acceleration. Her power is the direct opposite of Velzard’s; she pushes things to move faster until they disintegrate at a molecular level. After Rimuru upgraded her skill to “Cthugha,” she gained the ability to leap through space-time and dimensions. This means she can attack from the past, future, or a different universe entirely.

Her “Cardinal Cage” is a multi-dimensional prison that very few can escape. Velgrynd is the fastest being in the series, and her devotion to Masayuki (the reincarnation of Rudra) gives her a combat drive that makes her absolutely lethal in the final war.

10 Veldora Tempest Exploits Probability With the Chaos Lord

Veldora, the Storm Dragon, has come a long way from the beginning of the series. Under Rimuru’s influence, he has mastered his massive magicule stores and developed the Ultimate Skill “Nyarlathotep.” This skill allows him to “manipulate probability,” meaning he can turn a 1% chance of winning into a 100% guarantee.

He can also move within suspended time, a feat only the strongest beings can achieve. While he is often played for laughs, Veldora’s raw power is second only to his siblings, and his “Fertile Paradox” can literally bring life back to a dead wasteland. He is the ultimate wildcard of the Tempest faction.

9 Velzard Controls Deceleration and the Power of Envy

As the eldest of the remaining True Dragons, Velzard is the personification of “fixation” and “deceleration.” Her aura can freeze time itself, and her Ultimate Skill, “Gabriel,” provides her with the ultimate defense through the manipulation of energy particles. She is so powerful that she can suppress the rowdy Veldora with a single glance.

In the later volumes, her alignment with Feldway makes her a terrifying obstacle. She can create an “Eternal World” where nothing moves, effectively ending a fight before it even begins. Her cold, calculated approach to combat makes her a much more dangerous opponent than her more hot-headed siblings.

8 Guy Crimson is the Prideful Mediator and Strongest Demon

Guy Crimson is the first of the Primordial Demons and the “Mediator” of the world. He has existed since the beginning of time and has never truly lost a fight. His Ultimate Skill, “Lucifer,” allows him to copy the abilities of anyone he sees, but his real strength lies in his millennia of combat experience.

Guy is the ultimate balanced fighter; he is incredibly fast, physically strong, and a genius at magic. Whether he is fighting True Dragons or rogue angels, Guy remains the gold standard for what a Demon Lord should be. He doesn’t rely on gimmicks; he is just better at fighting than everyone else.

7 Milim Nava Possesses Infinite Magic Through the Stampede

Milim Nava is the daughter of Veldanava, and she inherited his most dangerous trait: the “Mana Breeder Reactor.” This allows her to generate an infinite amount of magicules. When Milim enters her “Stampede” mode, she becomes a mindless engine of destruction that cannot be stopped by conventional means. 

Her Ultimate Skill, “Satanael,” feeds on her rage to increase her power limitlessly. In Volume 22, we see that her raw output is so high that it can bypass almost any defense. She is the only being Guy Crimson truly fears fighting in an all-out war, as she simply never runs out of energy or stamina.

6 Michael Uses Ultimate Dominion to Control the True Dragons

Michael is a Manas, a sentient Will born from the Ultimate Skill “Justice King Michael.” His power is terrifying because it strikes at the very core of the world’s power system. With “Regalia Dominion,” Michael can take over the minds and bodies of almost anyone, including True Dragons like Velzard. This makes him one of the most dangerous entities to ever exist. 

He can summon an “Armageddon” of millions of angels and possesses a “Castle Guard” defense that is theoretically impenetrable as long as he has followers. While he eventually falls to Rimuru’s superior analysis, his ability to enslave the world’s strongest beings puts him in the top tier.

5 Feldway is the First Angel and Master of Manas Michael

Feldway was the first of the Seven Angels of Origin created by Veldanava. After billions of years of resentment over his creator’s “death,” Feldway has become the ultimate antagonist. He wields the Manas Michael, which allows him “Ultimate Dominion” over anyone possessing an Angelic Skill. 

Feldway is a master of teleportation and multi-dimensional combat. His “True Body” is hidden away, making him nearly impossible to kill, and his command over the Phantom Army makes him a global threat. He isn’t just a fighter; he is a brilliant strategist who almost succeeded in rewriting the world in his image through sheer manipulation and divine magic.

4 Zelanus Rules the Insectars With Peerless Physical Prowess

The King of the Insectars, Zelanus, is a monster of pure biological perfection. He was born from the wreckage of the previous world and was hand-picked by Veldanava to rule the insect realm. His physical stats are so high that he can trade blows with Milim Nava and Guy Crimson. 

Zelanus possesses a body that is harder than any armor and a combat instinct that has been honed over millions of years. In the final arcs, his “Sephirot” evolution makes him nearly untouchable. He represents the pinnacle of physical evolution in the series, proving that sometimes, raw strength and an unbreakable shell are enough to challenge the gods themselves.

3 Ivarage is the World-Destroying Evil Dragon of Pure Chaos

Ivarage is the ultimate wildcard that keeps even the strongest characters awake at night. Known as the “World-Destroying Dragon,” Ivarage spent eons in the Otherworld, soaking up malice and raw power. Unlike the True Dragons, who are beings of order, Ivarage is pure, unadulterated chaos.

In the latest volumes, his awakening and evolution into a sentient being threaten the very fabric of reality. He doesn’t use skills in the traditional sense; he is a force of nature that consumes everything in his path. It took the combined efforts of the world’s elite just to contain him in the past, and in his current evolved state, he is a peerless disaster.

2 Rimuru Tempest Becomes a God-Like Entity With No Ceiling

Rimuru belongs second because the entire series is built around him breaking limits that should not be breakable. He begins as a reincarnated human and becomes the series’ central benchmark, with his evolving power tied to skills like Predator and the later growth of his core abilities. The story keeps elevating him until he is no longer just the protagonist who survives impossible fights. In fact, he becomes the standard by which everyone else’s strength is judged.

Rimuru is essentially a younger, more active version of Veldanava. His analytical speed is infinite, his defense is impenetrable, and he can manifest any skill in existence. He sits at number two only because Veldanava is the literal source, but functionally, Rimuru is the new God.

1 Veldanava Stands Above Everyone as the Omnipotent Creator Dragon

As the progenitor of all things, Veldanava occupies a tier entirely his own. He is not merely a “True Dragon” in the sense that Veldora or Velzard are; he is the “Will of God” that manifested to create the multiverse. In the endgame context of Volume 23, his presence looms larger than ever. Veldanava possessed the original versions of all Ultimate Skills, including the ability to create and destroy at will. 

While he gave up his omnipotence to experience life as a mortal, his peak power remains the absolute benchmark. No character, no matter how evolved, can truly surpass the entity that defined the laws of magic and physics. He is the alpha and the omega of the Tensura mythos.

Here’s a quick summary of the ranks of the 15 most powerful characters in That Time I Got Reincarnated as a Slime:

Rank	Character	Core Powers & Ultimate Abilities
1	Veldanava	Omnipotence: Creation and destruction of the multiverse; ownership of all original Ultimate Skills.
2	Rimuru Tempest	Void God Azathoth: Imaginary Space (infinite storage/consumption) and the hyper-intelligent Manas: Ciel.
3	Ivarage	Evolved Chaos: Pure destructive energy capable of consuming reality; lacks traditional skill constraints.
4	Zelanus	Biological Perfection: Near-infinite physical durability and the Sephirot evolution of the Insectar race.
5	Feldway	Ultimate Dominion: Mastery over Angelic Skills and the Manas Michael; multi-dimensional existence.
6	Michael	Regalia Dominion: Mental and spiritual enslavement of True Dragons; impenetrable Castle Guard defense.
7	Milim Nava	Mana Breeder Reactor: Infinite magicule generation via Satanael; raw destructive “Stampede” mode.
8	Guy Crimson	Ability Mimicry: The skill “Lucifer” allows him to copy any ability; peak demonic combat experience.
9	Velzard	Deceleration: Fixation energy that can freeze time and stop all molecular motion via the skill Gabriel.
10	Veldora Tempest	Probability Manipulation: Chaos Lord Nyarlathotep allows him to force favorable outcomes in combat.
11	Velgrynd	Dimensional Leap: Infinite acceleration and the ability to strike across different time periods and universes.
12	Chloe Aubert	Time Paradox Mastery: Existence outside causality; ability to stop time and utilize millions of years of sword skill.
13	Dagruel	Magic Nullification: A massive physical body that naturally cancels out all magical attacks and reality warping.
14	Diablo	Instant Resurrection: Absolute immortality through conceptual rebirth; control over the “Temptation World.”
15	Zegion	Mephisto (Illusion King): Turns an opponent’s reality into a nightmare; God-grade physical exoskeleton.

Taken as a whole, this final light novel-based power scale is less about who looks coolest and more about who survives the story’s collapse of normal rules. The anime has only reached Season 4 so far, with Episode 3 recently aired on Crunchyroll, but the manga volume 23 is available on Kodansha for you to read, in case you can’t keep your curiosity in check.

But feel free to debate in the comments below if you think our ranking is different than yours.

That Time I Got Reincarnated as a Slime is streaming on Crunchyroll and Netflix.