Summary

The Primordials pose a threat with immense power that can overpower the Jura Tempest Federation.
Alternate personality Hero Masayuki is a devious threat willing to dominate the world at any cost.
The Eastern Empire's great military might and political influence make them a dangerous threat to the Jura Tempest Federation.

With the power Rimuru has acquired in the That Time I Got Reincarnated As A Slime anime and manga series, he has gone on to establish a nation of monsters that seek to ally with humans. Known as the Jura Tempest Federation, Rimuru plans to build his country into a hegemon great in the arts, food, and financial prowess.

That Time I Got Reincarnated As A Slime: Ranga's Evolution, Explained

Ranga's evolution throughout the series is a narrative reflection of his growth from a simple Direwolf to a powerful guardian of Rimuru.

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By Oluwatokiloba Folami

With his and Veldora’s immense power and Jura Tempest’s potential, few can threaten the country. However, that makes all those who can, all the more important and dangerous. Some Ancient Demon Lords serve as threats simply because of their immense power, while others actively stand against Rimuru. Time will tell whether or not the Jura Tempest Federation will be able to ward off various threats. However, these threats must first be identified in the That Time I Got Reincarnated As A Slime series.

6 Primordials

Immense Power That Can Potentially Overwhelm The Forces Of Jura Tempest

Debut Chapter: 67

As strong individuals with an unpredictable nature, the Primordials remain a threat to anyone and everyone they set their eyes on. Despite Rimuru already subjugating Noir and renaming him Diablo, the Queen of Elves, Elmesia El-Ruivell, still considered Diablo a threat to even Rimuru.

While Diablo is fiercely loyal to Rimuru, the loyalties of the other Primordials make them a threat. Once, the White Primordial, Blanc, obliterated an entire country to avenge a friend, while the Yellow Primordial, Jaune, now known as Carrera, often sent nuclear-level spells to a country for the fun of it. Because of how powerful the Primordials are, they never truly die. And while Rimuru may eventually subjugate more Primordials, he’ll always need to watch out for those who remain outside of his influence.

5 Hero Masayuki

Devious Alternate Personality Willing To Dominate The World At Any Cost

Masayuki Honjo Chosen Hero – That Time I Got Reincarnated As A Slime Season 3

Debut Chapter: 48

So far, That Time I Got Reincarnated as a Slime anime series has portrayed the hero, Masayuki, as a timid hero who has overcome countless events because of his unique skill, the chosen one. While that is true, there is much more to the chosen hero, as his alternate personality, Rudra Nam Ul Nasca, serves as the Emperor of the Eastern Empire. As a legendary historical figure, this Emperor served as the first Emperor of the Eastern Empire but has reincarnated so many times that he has gained a corrupted mind.

Moreover, he then exists in the same space-time as the hero, Masayuki, a person Rimuru has forged an alliance with. Interestingly, Rudra Nam Ul Nasca is in competition with Guy Crimson to see who gets to rule the world, but his corrupted personality allows him to use any means possible. As an alternate personality from Rudra, Masayuki lives an autonomous life; however, some of his actions remain influenced by that of the Eastern Empire emperor, making him a threat, particularly because Rimuru considers him an ally.

4 The Eastern Empire

Possesses Great Military Might

Debut Chapter: 2 (First Mention)

Following the creed “Power is Everything,” this powerful empire remains one of the biggest, if not the biggest threat to the Jura Tempest Federation. The Empire, particularly its military, is known as the strongest in the entire world, and for good reason. Aside from being 2.1 million strong in its military might, the military strength of the empire includes Velgrynd, the Scorch Dragon, Gadra, a mage that has lived for over a thousand years, and even Yuuki Kagurazaka.

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That Time I Got Reincarnated As A Slime Reveals One Of The Series' Most Terrifying Abilities

Diablo used a terrifying ability to defeat the Clerics of the Seven Luminaries. Just what is "Despair Time" and what makes it so powerful?

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By Naledi Ramphele

Some of its high-ranked members possess God-grade and legendary equipment, with which they are able to cause untold destruction. Aside from its powerful emperor, the Eastern Empire can lay waste to various countries and is well known for conquering lands. Often, the Eastern Empire gives two options to those it wishes to annex—submit or die, and of recent, the Eastern Empire has set its eyes on the Jura Tempest Federation, seeing it as a means to then conquer the West.

3 The Rozzo Family

Their Immense Political Influence and Power Dynamic Makes Them Dangerous

Debut Chapter: 92

Led by Granbell Rozzo, the Rozzo family started off as an organization that helped humans, portraying its ruler's ideals. Unfortunately, after the death of his wife, Granbell’s Rozzo ideals morphed, and rather than just protect humanity, he sought to be their ruler, albeit from the shadows.

Creating the Council of the West alongside various important factions to rule the West from the shadows served as a great way to rule from behind the scenes while acquiring power. However, with the power the Rozzo family commanded, Maribel Rozzo, Granbell’s granddaughter, became a threat to Jura Tempest with all her plans to instill chaos and destroy the budding country. Maribel’s plans and backing pose a threat to Jura Tempest, and her ultimate skill, Greed, is no joke that Rimuru can afford to underestimate.

2 Guy Crimson

Vast Strength And Ability To Influence World Events

Debut Chapter: 9(First Mention); 76 (Appeared)

Known as one of the most powerful beings in the world, this Primordial turn Demon Lord threatens the evolution of the Jura Tempest Federation with his presence alone. Guy isn’t one to antagonize others for power or status; however, he remains firmly against upsetting the world’s power balance, something Rimuru has a knack for ignorantly doing.

The Ten Great Saints – That Time I Got Reincarnated As A Slime

That Time I Got Reincarnated As A Slime: Ten Great Saints, Explained

Here's a closer look at the Ten Great Saints and what their role is in That Time I Got Reincarnated As A Slime.

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By Naledi Ramphele

As the first seat of the Octagram and his vast abilities and relation to even Veldanava, should Guy Crimson ever set his eyes on preventing the growth of the Jura Tempest Federation, Rimuru would have more than enough to worry about. Thankfully, Guy tends to act reasonably and doesn’t antagonize others needlessly. As long as Rimuru doesn’t disrupt the world's power balance, everything should be fine, but can Rimuru be trusted to maintain the status quo?

1 Cerberus

A Dark Society With A Manipulative Antagonist For A Leader

Yuuki Kagurazaka in That Time I Got Reincarnated As A Slime

Debut Chapter: 92

Yuuki Kagurazaka is one of the most morally ambiguous characters in the entire series. In the web novel, he serves as the main antagonist, but the light novel portrays him as some form of misguided hero. Either way, Yuuki has big plans to change society and create a world he envisions; unfortunately, like most misguided heroes, his plans require immense sacrifices and a structural change to society.

As the grandmaster of Cerberus, an underground society situated in the east, Rimuru’s empire serves as a problem that Yuuki cannot allow to grow out of control. In a bid to control the growth of the Jura Tempest Federation and puppeteer it by his own means, Yuuki remains antagonistic to Rimuru while he maintains a ‘friendship’ on the surface.

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