That Time I Got Reincarnated as a Slime (Tensura) didn't just give us a feel-good isekai; it redefined the power-fantasy genre. It’s the perfect blend of cozy slice-of-life, political strategy, and the simple joy of watching an overwhelmingly powerful protagonist (Rimuru) turn a swamp full of monsters into the world's most successful, technologically advanced, and well-fed nation (Tempest).
If you finished the last season and need more fantasy heroes who conquer armies with logistics and friendship, these 10 anime will fill the Rimuru-sized void in your schedule.
Overlord
Ainz Ooal Gown is the reverse of Rimuru in every way except for his ridiculously high stats. While Rimuru wants peace, Ainz (formerly Momonga) wants to conquer the world—mostly because he’s bored and terrifyingly efficient. Ainz wakes up trapped in the body of his terrifying Lich avatar inside his favorite game, and he commands the Great Tomb of Nazarick, a fortress filled with max-level, loyal NPCs. This is the purest form of the OP power fantasy, focusing heavily on strategic conquest and watching the sheer terror Ainz instills in his opponents. If you want a fantasy leader who dominates through sheer power and perfect logistics, this is your next binge.
The Eminence in Shadow
If Rimuru decided that the only cool way to run Tempest was entirely from the shadows, you’d get Cid Kagenou. Cid is reborn into a fantasy world with one goal: to become the ultimate Eminence in Shadow. He invents a fake villainous cult and a fake resistance organization (Shadow Garden). The hilarious twist? His fake stories turn out to be 100% real, and he is now the actual leader of a powerful organization saving the world, entirely by accident. This series takes the OP protagonist trope and injects a massive dose of satirical comedy and explosive action.
How a Realist Hero Rebuilt the Kingdom
Dr. Stone
Senku Ishigami is an isekai protagonist who decided magic is boring. After humanity is turned to stone, Senku is revived and chooses to rebuild the world using the power of science. He is ridiculously overpowered, not because of spells, but because he holds two million years of human ingenuity in his head. Like Rimuru, he constantly searches for resources, invents necessities (like electricity and antibiotics), and uses diplomacy (and sometimes calculated genius) to bring together people to form the Kingdom of Science. It's the ultimate fantasy of nation-building driven by pure intellect.
Log Horizon
If you appreciate Rimuru's use of non-violent, intellectual power, meet Shiroe. When players get trapped in the MMORPG Elder Tale, Shiroe, the genius strategist, quickly realizes that brute force won't fix anything. He creates the Round Table governing organization to stabilize the chaotic city of Akihabara. This series is heavy on political maneuvering, economic theory, and understanding world mechanics. It explores what happens when players have to become actual citizens, leading to a satisfying fantasy where intelligence is the ultimate weapon.
Saga of Tanya the Evil
If you want a reincarnation story with zero comfort, meet Tanya Degurechaff. A ruthless Japanese salaryman is reborn as a little girl in a magical, alternative World War I-era European army. Tanya is ridiculously OP, but she only uses her power for one goal: rising through the ranks as quickly as possible to achieve a safe, civilian desk job. This series swaps nation-building for military strategy and philosophical depth. It's the darker, grittier side of the "reincarnated genius" trope.
No Game No Life
Sora and Shiro, the sibling NEET duo known as [Blank], are summoned to a fantasy world where a God has decreed that all conflict—from territorial disputes to war—must be settled through games. Like Rimuru, their superpower isn't raw physical strength but overwhelming, unmatched genius. They quickly start conquering the world, not by raising armies, but by consistently winning complex games using incredible psychology, trickery, and flawless teamwork. It's the ultimate strategy-based power fantasy.
Ascendance of a Bookworm
This is the ultimate wholesome companion to Tensura. Urano is reborn as the frail young girl Myne in a medieval world lacking the one thing she desperately craves: books. Since paper is nonexistent, Myne sets out to change the world by inventing everything required to create and distribute books, from printing presses to better hygiene. It focuses on the minute details of building modern infrastructure and social influence, giving it the same satisfying "creating a better life" feel as Rimuru's work in Tempest.
The Misfit of Demon King Academy
If you need an OP protagonist who makes Rimuru look like a beginner, meet Anos Voldigoad. The Demon King is reincarnated 2,000 years later to find his descendants weak and the world underwhelming. Anos is so powerful that when a test measures his magic power, the number breaks the machine and is labeled "unfit." He attends an academy where he is constantly underestimated, which gives him endless opportunities to effortlessly demolish arrogant fools. This series is pure, unadulterated power fantasy with zero downtime.
Re:ZERO - Starting Life in Another World
This is the anti-Rimuru isekai. Subaru Natsuki is summoned to a fantasy world with only one power: "Return by Death," which allows him to restart time after he dies. Unlike Rimuru, Subaru is physically weak, mentally fragile, and suffers immensely. However, he uses his terrifying power to gain strategic knowledge and manipulate events, protecting those he loves and navigating complex political conflicts (like Rimuru). If you want an isekai where the power fantasy is earned through trauma, this one delivers incredible character growth and world-building.
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