One of the standout entries into the isekai genre, That Time I Got Reincarnated as a Slime takes viewers on a journey alongside Rimuru Tempest, the reincarnation of Satoru Mikami, a romantically despondent corporate worker who gets stabbed in the streets. He wakes up as an amorphous entity later named by Veldora as Rimuru Tempest.

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Rimuru meets several individuals in this world who are as diverse as they come. From Majins to Orc Kings and Demon Lords, these characters come with varying levels of strength, but each possesses unique traits and skills that make it tough but not impossible to categorize them according to strength. Here are the ten strongest characters in That Time I Got Reincarnated as a Slime.

Updated May 9, 2024, by Emedo Destiny: With the release of its third season upon us, That Time I Got Reincarnated As a Slime has done more than enough to earn its place as one of the best isekai of the last decade. The series follows the adventures of the slime called Rimuru Tempest after being reincarnated into the Central world from Earth as a human named Satoru Mikami. Thoroughly familiarising himself with his new world, Rimuru's journey of survival and establishment brings him in contact with varying beings and species, some of which are the most powerful beings of the realm, like the dragon Veldora, among others ranging from high orcs to demon lords. So, accordingly, here are some of the series' most powerful characters in terms of strength.

15 Adalmann

Species: Death Spirit

• Anime Debut: Episode 40: The Congress Dances
• Occupation: Labyrinth Guardian
• Strongest Ability: Necronomicon, Book of Magic

Formerly one of Clayman's Index Finger of the Five Fingers, Adalmann is an undead now in service to Rimuru Tempest and the guardian of the 70th floor of the dungeon and is one of Rimuru's Twelve Guardian Lords.

As one of the Twelve Guardians Lords, Adalmann is an extremely powerful lich capable of using holy and demonic magic in conjunction with his necromancy abilities as an undead. As a previous devout follower of the Luminous faith, Adalmann possesses fanaticism, shown in his immovable display of faith loyalty in Rimuru. Even among the Guardian Lords, Adalmann ranks fairly, as he is a special S-Rank monster.

14 Berreta

Species: Chaos Metalloid

• Anime Debut: Episode 23: Saved Souls
• Occupation: Guardian
• Strongest Ability: Deus Ex Machina, Lord of Machine God

Once a Greater Daemon, Beretta is a bodyguard of Rimuru, whom he summoned to inhabit a golem creation of his own. Upon her summoning, Beretta evolved into an Arch Doll, granting even more powers as she became Rimuru's guardian entity. As a gesture to Ramiris by Rimuru, Beretta becomes Ramiris' permanent guardian at the latter's behest.

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As a Greater Daemon, Beretta was at least an A-Rank entity, implying she possesses incredible power. Her evolution into an Arch Doll signified increased strength, making her more powerful than a sky dragon and evolving further into a Special A-Rank monster. As a Chaos Doll, Beretta possesses a Chaos Core, putting her on par with a demon lord seed and now an S-Rank monster.

13 Shion

Species: Divine Fighter

• Anime Debut: Episode 9: Attack of the Ogres
• Occupation: Secretary
• Strongest Ability: Susanoo, Lord of Tyranny

Rimuru's first-ever secretary, Shion, is one of the executives of the upper echelon of the Jura Tempest Federation. Among the Twelve Guardian Lords, Shion commands her army, known as the 'Yomigaeri.' Formerly an Ogre, Shion evolved through the help of Rimuru into a Kijin and then into an Oni, leading to massive differences in power and physical traits.

Shion is a specialist at close combat and an immensely powerful melee fighter characterised by her impressive brute strength and swordsmanship. Capable of the ultimate skills called the Susanoo and Lord of Tyranny, Shion is easily above a sky dragon and on par with Beretta, making her a special S-Rank monster.

12 Geld

Species: Divine Boar

• Anime Debut: Episode 15: The Jura Forest Alliance
• Occupation: Minister of Infrastructure
• Strongest Ability: Beelzebub, Lord Of Gourmet

Geld stands out among Rimuru’s followers as one of the strongest, especially as the Orc King. Now filling the position once held by his father, Geld’s power is comparable to the former Orc King.

Although certainly not the strongest of Rimuru’s subordinates, his physical strength and size are intimidating enough. With extra skills like being able to enhance his strength, use the earth as a tool, and manipulate his opponent’s actions through their thoughts, Geld is strong enough to wipe out a whole town or village.

11 Hakurou

Species: Oni

• Anime Debut: Episode 9: Attack of The Ogres
• Occupation: Instructor
• Strongest Ability: Martial Master

Hakurou was strong even before Rimuru named him, but Rimuru certainly had an effect on him, making him stronger in several ways. He is strong and great with a sword, and his ability to keep his body temperature and presence under control is one of his great skills.

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He gained an increase in the speed of his thoughts, making him perceive things in battle faster and more easily. Although Hakurou has undeniable strength, he relies heavily on his skill with a sword as it gives him an edge.

10 Benimaru

Species: Divine Oni

• Anime Debut: Episode 9: Attack of The Ogres
• Occupation: Minister of Defence
• Strongest Ability: Amaterasu, Lord of Shimmering Flames

As a Majin serving Rimuru, Benimaru’s strength is a given. He stands out even among the Twelve Guardian Lords. He’s just like Hakurou, possessing an enviable swordsmanship skill. His ability means he’s well-equipped for his role as the Jura Tempest Federation’s Minister of Defense.

Benimaru’s personality may not match his ability, but it’s clear from the way he carries himself that he knows how capable he is. He’s also proud enough to avoid engaging those he considers to be beneath his level in strength, skills, and fighting ability.

9 Hinata Sakaguchi

Species: Divine Human

• Anime Debut: Episode 23: Saved Souls
• Occupation: Chief of The Holy Knight Order
• Strongest Ability: Fortuna, The Lord of Odds

Hinata Sakaguchi may owe her weapon, the Moonlight Rapier, to Luminous Valentine, who is stronger than she is, but Hinata can certainly handle her own in a battle. She loves to fight with rapiers, and her Moonlight Rapier inflicts wounds that are notoriously hard to treat.

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Because of her strength, she is the most powerful in the church. With the Usurper ability, she can take power from those stronger than she is, making them weaker and easier to beat. With her skill called Mathematician, she can even predict the future.

8 Carrion

Species: Divine Beast

• Anime Debut: Episode 16: Demon Lord Milim Attacks
• Occupation: Aide to Demon Lord Milim
• Strongest Ability: Royal Beast Form

Carrion is also called the Beast Master because he heads the Beast Kingdom Eurazania. As an aide to Milim Nava, strength and courage are important to him. But he also knows how to avoid a battle when he sees that the odds are stacked against him.

His Beast Roar shoots magic like a canon with incredible speed, and its power was enough to affect Milim Nava. Carrion also developed the Burst Roar using the Beast Roar as a base. With the Burst Roar, he basically uses his body as a weapon.

7 Diablo

Species: Daemon

• Anime Debut: Episode 24: Extra: Black and a Mask
• Occupation: Butler
• Strongest Ability: Azazel, Lord Of Temptation

Diablo is Rimuru’s secretary and butler, and one of his most powerful followers. He is cool-headed and mischievous, but quick to turn into a menacing presence if Rimuru is affected in any way.

Diablo's ultimate skill, the Azazel, unites his other skills called Tempter and Seeker. It includes a combination of several abilities, like accelerating his thoughts, using Demon Lord’s Haki to make an opponent go insane, or building the ultimate barrier to protect from emissions or other physical and elemental attacks, with a chance to customize the barrier to suit any threat.

6 Luminous Valentine

Species: Vampire

• Anime Debut: Episode 45: Adalmann, the Index Finger
• Occupation: Ruler of The Night Garden
• Strongest Ability: Asmodeus, Lord of Lust

The Fifth seat at the Octagram, Luminous Valentine is a demon lord and ruler of all vampires and the True Ruler of the Holy Empire of Ruberios. As one of the oldest demon lords, she is mighty.

Typical of a demon lord, Luminous is an arrogant individual who revels in her superiority to other species. However, Luminous is rather fond of her friendships with Chloe and Hinata, which were forged through harrowing years of establishing Ruberios as her domain after the destruction of Night Rose by Veldora. As a Demon Lord, she is capable of an Ultimate Skill as required and immensely proficient at using Holy magic, making her a special S-Rank monster.

5 Dagruel

Species: True Giant

• Anime Debut: Episode 45: Adalmann, the Index Finger
• Occupation: Demon Lord
• Strongest Ability: All Things Destruction

One of the Demon Lords, Dagruel, is the giants' leader and the fourth seat at the Octagram. Dagruel stands over two meters tall and has the appearance of a middle-aged man, making him a fearsome individual to behold. Keenly observant and calmer than his appearance outlays, Dagruel possesses the incredible strength required of a demon lord, which ranks him among the Upper Echelon of the Octagram.

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Without an ultimate skill, his spiritual life form is still comparable to true dragons like Veldora Tempest. Reinforcing the bruteness associated with Giants, Dagruel's fighting style revolves around using his bare hands to cause immense destruction, which earned him the title of the 'the Earthquake.'

4 Veldora

Species: True Dragon

• Anime Debut: Episode 1: The Storm Dragon, Veldora
• Occupation: Guardian Deity of Jura Tempest
• Strongest Ability: Nyarlathotep, Lord of Chaos

Veldora is a True Dragon, and he's also called Storm Dragon Veldora. His dragon form is quite intimidating, with scales of black steel and a gigantic body. He is categorized as Catastrophe-class and is strongest in the Jura Tempest Federation.

Veldora’s human form is not to be ignored, with a notable skill in hand-to-hand combat called Veldora Killing Arts, which he developed using Rimuru’s memories. He can also shapeshift into different forms, manipulate space and time, and magically shred anything in his path using his Dragon Spirit Haki.

3 Rimuru

Species: Demon Slime

• Anime Debut: Episode 1: The Storm Dragon, Veldora
• Occupation: Adventurer, Monarch of Tempest
• Strongest Ability: Azathoth, God Of Void

Rimuru Tempest is the form Satoru Mikami takes in the world of That Time I Got Reincarnated as a Slime. Initially a slime form of 40cm in diameter, Rimuru’s size increases with added strength.

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These individuals, when necessary, may alter their size, and some can even alter the form of various body parts.

Although mostly coming off as a childish person, Rimuru has a mind that is analytical and strategic and can go off on an opponent without hesitation. Rimuru’s Azathoth ultimate skill combines the skills of Raphael, Beelzebuth, Veldora, and Velgrynd. The Azathoth is enough to destroy surroundings and devour souls. Rimuru can also use the Azathoth as a kind of prison.

2 Guy Crimson

Species: Daemon

• Anime Debut: Episode 42: The Demon Lords
• Occupation: Demon Lord
• Strongest Ability: Lucifer, Lord of Pride

Guy Crimson’s relaxed nature doesn’t quite match his strength and reputation as one of the strongest in the world of That Time I Got Reincarnated as a Slime. Guy Crimson has the kind of strength that Luminous Valentine claimed is enough, at full capacity, to destroy humanity completely.

Even Rimuru acknowledges that Guy Crimson’s power is untouchable and beyond the level of most individuals. He uses the ultimate skill called Lucifer, which evolved from the ultimate skill called Pride after he fought the Frost Dragon, Velzard.

1 Milim Nava

Species: Dragonoid

• Anime Debut: Episode 16: Demon Lord Milim Attacks
• Occupation: Demon Lord
• Strongest Ability: Satanael, Lord Of Wrath

Veldanava’s daughter and Rimuru’s best friend and ally, Milim Nava can be mistaken for a child when she’s really a Dragonoid. She’s the one person able to rival Guy Crimson, and they once battled for seven days.

She uses the ultimate skills, Satanael and Milim Eye. Satanael allows her to use magicules and her anger to extend her endurance to basically infinity, and protect herself by destroying everything in her path. The Milim Eye skill makes her impossible to lie to. Her weapon, the Asura, is the strongest there is.

That Time I Got Reincarnated as a Slime

Action

Adventure

Isekai

Main Genre

Anime

Seasons

3

Studio

Eight Bit

Japanese Title

Tensei shitara Slime Datta Ken

Based On

Novel & Light Novel

Creator

Fuse

Streaming Service(s)

Hulu , Crunchyroll

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