The best anime or top anime of all time is none other than Tensura, AKA That Time I Got Reincarnated as a Slime. A bold statement, but too close to the truth. Forget classics like Steins;Gate, Berserk, or Monster for some time. Also, forget the new sensations like Demon Slayer, Attack on Titan, or Solo Leveling. Tensura gives us something that anime fans crave from the bottom of their hearts. Be it ‘feel-good’ sensations, world-building, slow-paced power-ups, wow moments, serious moments, funny moments, reincarnations, diabolical villains — in short, everything is packed up nicely in That Time I Got Reincarnated as a Slime.
And most of all, it is the best anime to binge-watch anytime you wish without getting bored — sort of like One Punch Man. In the following parts of this blog, I’ll prove to you why Tensura is the top anime of all time.
Firstly, if you don’t have time to read it fully, come back later when you do because I put this all together after hours of researching and days of writing. I would love it if you read it from top to bottom. Only this way will you understand why it is the best anime of all time. P.S. You will discover new and exciting events and developments about the anime itself and its characters. Beware, there might be spoilers if you still have to watch Slime Season 3.
Secondly, the blog is divided into two main parts and various sub-parts (I have made subheadings to make it easier to go through). The first part is about Tensura itself, its main characters, and what they bring to the story. The next part is how this anime takes the top spot among anime. It will describe various elements, structures, and more which make it stand out. Let’s get started!
Part 1: The World of Tensura
The Story That Started It All
Satoru Mikami, from modern-day Japan, is stabbed in Tokyo while helping his friend escape from a robber. At the time of his death, he is a 37-year-old Japanese salaryman and reincarnates in a fantasy world as a blue slime. While discovering his new body and abilities, he comes across Veldora, the Storm Dragon — one of the only four True Dragons in this fantasy world. They become sworn brothers; Veldora names him Rimuru, and he names him Tempest. Therefore, their common name becomes Tempest — like a family name.
In short, he swallows Veldora in order to help him escape Unlimited Imprisonment. Later, he helps the weak Goblins and other races in the Jura Forest. After some battles and fantastic developments, he establishes the Jura Tempest Federation and becomes its supreme ruler.
You might already know the story if you’ve watched it. Yes, he becomes a Demon Lord and even names the new Demon Lords as Octagram. During his journey (up until Season 3), he faced many strong foes. He defeated some while taming others.
Read more about the powers and abilities of Rimuru Tempest here.
The Main Characters and Their Roles
The character building is so exciting in Tensura that it almost makes the writers look like geniuses. It feels as if you are watching something that goes according to your heart’s desires. The “feel-good” state is kept alive with each passing episode. Let’s see the primary characters of Slime and how they influence the overall story.
Satoru Mikami / Rimuru Tempest
A 37-year-old salaryman reincarnated as a slime after dying in modern Japan. Gains the “Predator” and “Great Sage” skills, becoming the foundation of the Jura Tempest Federation. As the protagonist of the series, his main power is his intellect, strategy, and a range of powerful skills at his disposal. Furthermore, his friends, subordinates, and powerful allies make him a force to reckon with.
Veldora Tempest (True Dragon)
The sealed Storm Dragon who befriends Rimuru inside the cave. In Season 1, Episode 1, Rimuru absorbs him and grants Veldora freedom later in Season 2 when he becomes a Demon Lord. He and Rimuru share the same family name given by Rimuru. Only Ranga (the direwolf) is another character with their family name, Tempest.
Great Sage (later evolves into Raphael)
Rimuru’s internal skill and advisor that calculates, analyzes, and strategizes everything for him. This skill is perhaps the best skill in all the world of Tensura. It later evolves into Raphael — and in the light novels, even more.
Gobta, Rigurd, Rigur, and the Goblin Tribe
The first creatures Rimuru befriends; they name him their leader after he helps them fight direwolves. They are his loyal subordinates and are willing to lay down their lives for him.
Ranga
The son of the defeated direwolf chief who pledges loyalty to Rimuru and later becomes his personal mount and protector. The only subordinate who shares Rimuru’s family name, he is always by his side.
Kaijin
A skilled Dwarven blacksmith who aids Rimuru in building his new nation and forging weapons for his followers. He, along with his dwarf brothers, is responsible for the development of Rimuru — the capital city — and their advancements in buildings, housing, weaponry, and more.
King Gazel Dwargo
The honorable King of Dwargon who recognizes Rimuru’s leadership and forms diplomatic relations with him. He is a strong ally of Rimuru, and the slime often looks to him for advice in ruling and political matters. He is also the first nation to recognize Tempest as a legitimate country.
Shizu Izawa (Shizue)
A Japanese adventurer summoned to this world by Demon Lord Leon Cromwell and possessed by the fire spirit Ifrit. She becomes Rimuru’s emotional anchor before dying peacefully. Rimuru wears her face when he transforms into a human body since he swallowed her due to her dying wish. He holds her in high regard since she was the one Rimuru was destined to be with (according to an elf who could catch glimpses of the future). In short, she contributed most towards Rimuru’s growth.
Ifrit
The fire spirit bound within Shizu, given to her by Leon Cromwell. After their battle, Rimuru absorbs Ifrit and gains his fire abilities.
Ogres (later Kijin: Benimaru, Shion, Shuna, Souei, Hakurou, and Kurobe)
Once victims of the Orc invasion, they join Rimuru and evolve into powerful Kijin after being named. In Rimuru’s army, they are some of the most powerful individuals. Especially Benimaru, who commands his army and can easily defeat most of the primary figures in the Slime world.
Orc Lord / Geld
A tragic figure manipulated by Gelmud and Clayman, who leads the Orc army before being purified by Rimuru. Later, after the defeat of Demon Lord Geld, Rimuru named his son Geld (as a gesture of respect for his father). He is now a powerful ally of Rimuru, overseeing most of the construction projects in Tempest.
Gelmud
A low-ranking Majin working under Demon Lord Clayman who orchestrates the Orc invasion. He got a satisfying ending when Demon Lord Geld takes care of him during the battle.
Demon Lord Milim Nava
The childish yet immensely powerful Demon Lord who befriends Rimuru and becomes a key ally (and comic relief). She is perhaps the oldest and the most powerful Demon Lord currently active, along with Guy Crimson. Veldora reveals during Walpurgis that she is the daughter of his brother (another True Dragon).
Demon Lord Kazalim – [President of Moderate Harlequin Alliance]
The big bad wolf of the Moderate Harlequin Alliance, and one of the old Demon Lords, Kazalim, AKA The Curse Lord. Defeated by the Demon Lord Leon Cromwell, who later took his place as one of the Demon Lords. He also created Deathman Demon Lord Clayman, who was also a member of the Moderate Harlequin Alliance. Presently in the anime, he is working alongside the mastermind Yuuki Kagurazaka, who aided in his rebirth.
Demon Lord Clayman [Moderate Harlequin Alliance]
The manipulative “Marionette Master” Demon Lord who controls others for his schemes, acting as the central villain of Season 1’s second half and Season 2’s first half. He met his end at the hands of Rimuru during Walpurgis. In short, his cunning plans fell short before Rimuru. Surprisingly, he was the weakest member of the Moderate Harlequin Alliance.
Tear [Moderate Harlequin Alliance]
Another member of the Moderate Harlequin Alliance. One of Clayman’s loyal agents, known for her illusion and combat magic.
Footman [Moderate Harlequin Alliance]
Also a member of the Moderate Harlequin Alliance, Tear’s partner; a brutal, jester-like Majin obsessed with destruction. He is one of the strongest in the group.
Laplace [Moderate Harlequin Alliance]]
The cunning leader of Clayman’s moderate clown troupe, often spying and manipulating from the shadows. He killed a Demon Lord–level vampire simply for disrespecting Clayman — and even mocked the vampire’s death afterward. This act alone showed just how powerful and ruthless he truly is.
Youm, Myulan, and Grucius
Human adventurers who become Rimuru’s allies; Youm later becomes the public “King of Falmuth” under Rimuru’s control.
Hinata Sakaguchi
Any fan of Slime would know Hinata. She fought with Rimuru and almost killed him. She is the leader of the Western Holy Church and a former student of Shizu. She fights Rimuru under false assumptions before later becoming an uneasy ally.
King Edmaris & Archbishop Reyhiem (Kingdom of Falmuth)
Greedy rulers who plot to destroy Tempest, triggering Rimuru’s transformation into a Demon Lord. They were defeated by Rimuru, who wiped out their entire army of 20,000 and claimed their souls to become a True Demon Lord.
Diablo (Noir)
One of the Primordial Demons summoned by Rimuru after his ascension. Calm, terrifyingly powerful, and obsessively loyal to Rimuru. He is the strongest individual among Rimuru’s loyal servants.
Demon Lord (ex) Carrion
The Beastketeers’ ruler and Demon Lord of Eurazania who forms an alliance with Rimuru after Clayman’s defeat. During Walpurgis, he stepped down from his Demon Lord seat and started serving Milim.
Demon Lord (ex) Frey
The Winged Demon Lord who works with Carrion and later helps dismantle Clayman’s faction. She also abandoned her Demon Lord seat and decided to serve under Milim.
Demon Lord Guy Crimson
The oldest and most powerful Primordial Demon Lord, known as “Red,” who oversees the other Demon Lords. He is one of the Primordials, who are supposed to be only seven, along with the likes of Black (now Diablo, serving Rimuru). But get this, he is far stronger than the current Diablo since, for thousands of years, he stayed in the underworld waiting for the perfect master. So, due to the lack of presence in the world, he couldn’t upgrade his powers. In short, he is a thousand years short of experience and power compared to the current Guy Crimson.
Demon Lord Ramiris
The Fairy Queen and one of the Ten Great Demon Lords who aids Rimuru, creating labyrinths and serving as comic relief. Presently living in Tempest as an honored guest.
Yuuki Kagurazaka
The mysterious Grandmaster of the Free Guild, later revealed as the mastermind behind multiple world-altering events. He manipulates Clayman and others for his hidden agenda. He is also one of the best and most powerful villains in the entire Tensura.
Demon Lord Luminous Valentine
The True Demon Lord and ruler of the Holy Empire Ruberios, later revealed as one of the world’s oldest and most strategic beings.
Louis Valentine & Roy Valentine
Her devoted servants; Roy acts as her decoy while Louis serves as her true knight and protector. Roy was killed by Laplace when he broke the news of Clayman’s death to him.
Demon Lord Leon Cromwell
The Platinum Saber, a Demon Lord who summoned Shizu from Japan. His motives remain complex as he walks the line between hero and villain.
Velzard (True Dragon)
The White Ice Dragon and Veldora’s elder sister; one of the four True Dragons, calm but immensely powerful. We have yet to see her in action in the anime.
Demon Lords Daggrull & Dino
Fellow Demon Lords introduced during Walpurgis; Daggrull is a Giant Lord, and Dino is the lazy yet dangerous Fallen Angel Lord. Not seen in action yet, we have a lot of data about them frm light novels though.
Part 2: Why Tensura Is the Top Anime of All Time
The Magic of World-Building
That Time I Got Reincarnated as a Slime portrays a fantasy world teeming with demi-humans, elves, dragons, and countless other races. Its intricate political strategies, power struggles, betrayals, and revenge plots make it one of the most compelling anime in its genre. The world-building is nothing short of genius.
In this universe, only the most powerful monsters can bestow names upon others — and unnamed monsters are inherently weaker. However, once named, they undergo evolution, gaining new forms and immense power. The protagonist, Rimuru Tempest, believes everyone deserves a name, so every monster in his nation is named — and as a result, incredibly powerful. This simple yet profound concept makes the series stand out as a masterpiece of creative storytelling.
Power Progression Done Right
Typically, in most fantasy anime, the hero or protagonist gets a cheat skill or system which he utilizes to get ahead of others and becomes the most powerful one. But in the case of Slime, it is not the case. Rimuru, during his life as a monster, gets all sorts of struggles and gets some of the most unique and powerful abilities.
His power progression is well done and with good reasonings. No out-of-the-blue power-ups are given to the protagonist. Even when he becomes a Demon Lord, it is for very good reasons, along with revenge and all. Furthermore, the concepts of power-ups and the rule of the survival of the fittest are excellently animated concepts that make this anime the top anime of all time.
Themes That Hit the Heart
Rimuru’s kind nature, combined with his ruthless attitude toward protecting his people, makes the overall theme of the anime a delight to witness. The feel-good elements of this anime are too good to ignore. I know most of you who have watched this anime feel the same.
Furthermore, the emotions, the music, and the dialogues are simply way too entertaining. If you decide to watch it, ensure you watch it with the real Japanese audio with subtitles. I don’t know if you’ll agree with me or not, but the subbed versions of the anime are way better than the dubbed ones. The dubbed ones simply cannot do justice to the original work.
Tensura Current Upate (As per anime)
So, Rimuru’s come a long way from being just a slime. He’s now running the whole show in Jura Forest—the Tempest Federation. It’s a real melting pot of monsters, from goblins and ogres to dragons, all living under one banner.
He pulled this off through smart deals, his unique ability to name and empower monsters, and by making powerful friends like the other Demon Lords, Milim and Guy. He’s got a solid team running things: Benimaru handles the military, Shion deals with administration (somehow), and Souei manages the spy network. Oh, and let’s not forget Veldora, the dragon, who’s basically his ultimate trump card.
But things are getting complicated. Human nations and merchant groups are getting nervous, creating outside pressure. Meanwhile, Tempest is developing fast. The story is really shifting into a phase of large-scale strategy and political intrigue. In this new reality, Rimuru’s circle of friends and allies isn’t just a bonus—it’s his greatest asset and the core of what comes next. Rimuru and his allies reside currenly in Tempest.
Also, Season 4 of the anime was announced in September, 2024 along with a second movie.
My Thoughts on That Time I Got Reincarnated as a Slime – Tensura
Tensura, or That Time I Got Reincarnated as a Slime, is the best anime of all time for many good reasons. And I am not saying this only because I love it — I’m saying this because it is the top anime that you can watch anytime, anywhere, and any number of times without getting bored. What are your thoughts on this? Let me know in the comments below. Till next time!
