Strongest Characters in That Time I Got Reincarnated as a Slime Season 4: The Ultimate Power Ranking
With That Time I Got Reincarnated as a Slime Season 4 officially set for April 3, 2026, the hype in the anime community is very real. As someone who has followed Tensura since the early arcs, I can honestly say this upcoming season feels like the moment where everything finally explodes—power scaling, political tension, and legendary characters all colliding at once.
Season 4 is expected to dive into some of the most intense light novel arcs so far, and that means we’re going to see the true top-tier monsters of this world flex their strength. Based on story progression, fan discussions, and how the anime has been adapting the source material, here’s my personal power ranking of the strongest characters who will dominate Season 4.
Top 7 Strongest Characters in Slime Season 4
1. Guy Crimson — The Untouchable Benchmark
There’s just no way around it—Guy Crimson is still the standard of power at this point in the anime.
- First of the Primordial Demons
- A True Demon Lord with millennia of combat experience
- One of the only characters who can move in a Time Stop (Suspended World)
Even with Rimuru’s insane growth, Guy still feels like the ceiling everyone is trying to reach. In Season 4, he’s not necessarily the main fighter, but his presence alone sets the tone for the power hierarchy.
2. Milim Nava — Pure Destruction Incarnate
Milim is chaos in the cutest form possible.
- Daughter of the Creator God
- Possesses near-infinite magicule reserves
- Her Stampede mode can literally threaten the entire world
Even if she’s Rimuru’s bestie, let’s be honest—if Milim ever went all out seriously, very few characters could stop her. Season 4 should highlight her importance both politically and as a raw force of nature.
3. Rimuru Tempest — The Rising Chaos Creator
Our favorite slime has come a long way, and Season 4 is where Rimuru begins closing the gap between Demon Lords and True Dragons.
- Ultimate Skills like Beelzebuth and Raphael
- Ability to store and analyze powers through Imaginary Space
- Rapid evolution through absorbing abilities and souls
He’s not quite above the likes of Guy yet, but the trajectory is obvious—Rimuru is heading toward god-tier status.
4. Veldora Tempest — Raw Power Refined
Veldora has always been ridiculously strong, but now he’s learning control.
- One of the True Dragons
- Massive magicule output
- Improved combat awareness thanks to Rimuru’s influence
He may still lack the refined technique of Guy or Velzard, but in terms of sheer destructive capability, Veldora is absolutely top-tier.
5. Velzard — The Ice That Freezes Time Itself
Velzard is often underrated by casual viewers, but she’s one of the scariest beings in the entire world.
- Eldest of the True Dragons
- Embodiment of stagnation and absolute cold
- On par with Guy Crimson in terms of threat level
Her connection to Guy and her role in maintaining balance make her extremely important moving forward.
6. Chloe O’Bell — The Hero Beyond Time
Chloe is one of the most fascinating and mysterious characters in Tensura.
- Known as the strongest Hero in history
- Possesses time-manipulation abilities
- Can move across timelines
She’s one of the very few “human” characters who can stand on equal footing with monsters and dragons. Season 4 is expected to finally dive deeper into her true nature.
7. Diablo — The Perfect Servant of Destruction
Diablo is easily Rimuru’s most dangerous subordinate.
- Primordial Demon (Noir)
- Absolute loyalty to Rimuru
- Ridiculous battle IQ and magical mastery
What makes Diablo special isn’t just power—it’s efficiency. He doesn’t waste time. If Diablo is sent to solve a problem, that problem is already over.
Quick Power Comparison Table
| Rank | Character | Main Strength | Threat Level |
|---|---|---|---|
| 1 | Guy Crimson | Time Stop mastery, experience | Extreme |
| 2 | Milim Nava | Infinite magicules, destruction | Extreme |
| 3 | Rimuru Tempest | Ultimate Skills, evolution | Extreme+ |
| 4 | Veldora Tempest | Raw dragon energy | Very High |
| 5 | Velzard | Absolute ice control | Very High |
| 6 | Chloe O’Bell | Time manipulation | Very High |
| 7 | Diablo | Combat intelligence | Very High |
What Season 4 Will Focus On
From what we know, Season 4 will heavily explore the Human–Monster Coexistence Sphere, the rise of the Rosso family as major antagonists, the expansion of the political structure of the world, and deeper involvement from Demon Lords and True Dragons.
And with a five-cour (50+ episode) format, we’re finally getting enough time to properly explore these arcs without rushing.
Final Thoughts from an Anime Fan
As someone who genuinely loves this series, Season 4 feels like the payoff for everything built so far. The world is bigger, the stakes are higher, and the characters we’ve grown attached to are about to show just how terrifying they truly are.
The best part? We’re only scratching the surface of what Tensura’s power system can really do.
If the adaptation is handled well, this could easily become the most iconic season of the entire series.
