The world of That Time I Got Reincarnated as a Slime keeps adding dangerous enemies for Rimuru Tempest. Some fight with raw power. Others use money and tricks. Mariabell Rosso belongs to the second group. She is a 10-year-old girl who looks innocent but controls entire nations from the shadows. Her story is different from other villains because she is not just strong. She is smart, greedy, and has lived multiple lives.
Mariabell first appeared in Season 3 of the anime and is set to become a major problem in Season 4. Her unique skill called Greed allows her to control people by using their own wants against them. This makes her very different from characters like Clayman, who uses physical strength and direct mind control.
Who Is Mariabell Rosso in the Slime Anime
Mariabell Rosso is the princess of the Kingdom of Siltrosso. She belongs to the Rosso family, which secretly rules the Western Nations. Her grandfather is Granbell Rosso, a former hero. But Mariabell is the real brains behind the family’s plans.
What makes Mariabell special is her past. She is a reincarnated person. In her first life, she was Maria Rosso, Granbell’s wife who died. Her soul then moved to another world where she ruled over Europe as a financial leader. That life gave her deep knowledge of money systems and control. When she died again, she was born as Mariabell with all her memories from both previous lives.
Voice actress Inori Minase brings Mariabell to life in the Japanese version. Kira Buckland voices her in the English dub.
The Rosso Family Economic Control Explained
The Rosso family does not use armies to control people. They use money. They created the Western States Council, which looks like a fair group of elected leaders. But most council members are either Rosso family members or people who owe them favors.
This family’s reach is huge. Even Yuuki Kagurazaka, the leader of the Free Guild, got his starting money from the Rosso family. They control trade, politics, and decisions across many nations.
Mariabell fits perfectly into this system. Her memories of economic rules from her past life make her better at this game than anyone else. She understands supply, demand, and debt in ways that people in the Central World cannot match.
Unique Skill Greed: How Mariabell Controls People
Mariabell’s power comes from her Unique Skill Greed. This skill belongs to the Seven Deadly Sins series, which are among the most dangerous abilities in the series.
Greed works differently from normal mind control. Clayman’s skill Puppeteer forces people to obey him directly. Greed is more subtle. Mariabell can see what people want the most. Then she makes those desires stronger. The person starts wanting to serve her because their own greed takes over.
This skill has limits. It does not work on people whose greed is stronger than Mariabell’s. It also fails against those with Ultimate Skills, which provide protection from mental interference. Rimuru Tempest has an Ultimate Skill called Raphael, which is why Mariabell could not control him.
Greed also has an attack called Long for Death. This power turns a person’s will to live into a wish to die. It is a terrifying ability for anyone who does not have strong mental protection.
Mariabell vs Clayman: Different Types of Villains
Fans often compare Mariabell Rosso to Clayman, another major antagonist in the series. Both are manipulators who work from the shadows. But they are very different.
Clayman uses direct control through his Puppeteer skill. He turns people into literal puppets. His strength grows when he awakens as a Demon Lord. In a direct fight, an awakened Clayman would likely beat Mariabell because her human body is weak.
Mariabell works differently. She does not need to fight directly. Her Greed skill works on a conceptual level. She controls economies, politics, and desires. In a long-term battle of influence, Mariabell wins every time.
The biggest difference is their arrogance. Clayman underestimated Rimuru and paid the price. Mariabell made the same mistake. She thought her intelligence and skill made her untouchable. She was wrong.
Mariabell’s Plan Against Rimuru and Tempest
Mariabell attends the Founder Festival in Tempest to see Rimuru’s nation for herself. She eats the food, watches the people, and studies how everything works. She realizes that Tempest is a real threat to her family’s control.
Her plan has several steps. First, she uses Duke Muese to create a money problem for Rimuru. Merchants demand payment in rare Dwarven Gold Coins, knowing Tempest does not have enough. The goal was to make Rimuru look bad and then have Duke Muese offer help, making Rimuru owe a favor.
But Empress Elmesia of the Sorcerous Dynasty of Thalion gives Rimuru the gold coins he needs. Rimuru then exposes Duke Muese’s scheme publicly and bans the problematic merchants from Tempest.
Mariabell also tries to control Yuuki Kagurazaka, thinking he is just a useful pawn. This is her biggest mistake. Yuuki has his own plans and his greed is stronger than hers. He pretends to be controlled while working against her.
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How Mariabell Meets Her End
Mariabell’s downfall comes from her own overconfidence. She believes her Greed skill can control anyone. When she finally faces Rimuru, she learns the truth. Her skill has no effect on him because his Ultimate Skill Raphael protects his soul.
After losing to Rimuru, Mariabell tries to run away. But Yuuki Kagurazaka is waiting. He reveals that he was never under her control. His desire for power is stronger than hers, making Greed useless against him. Yuuki then kills Mariabell and takes her Unique Skill Greed for himself.
Her death is sudden and brutal. After living three lives and ruling over two different worlds, she falls because she could not understand that some people want things more than she does.
“Why should it bother me, even if humanity or the world disappears?” – Mariabell Rosso
This quote shows her true nature. She does not care about anyone except herself. Her only goal is to have everything.
Why Mariabell Is a Memorable Villain
Mariabell Rosso stands out among That Time I Got Reincarnated as a Slime villains. She is not a demon lord or a monster. She is a 10-year-old human girl. But she is more dangerous than many characters with higher power levels.
Her intelligence makes her scary. She does not need to fight because she can make others fight for her. She does not need to steal because she can make people give her everything willingly. Her Greed skill represents how money and desire can control the world more effectively than violence.
Mariabell is also the only pure evil villain in the series according to some fans. Other antagonists have sad backstories or understandable reasons for their actions. Mariabell just wants everything. There is no tragedy in her past that explains her behavior. She is greedy because that is who she is.
The anime has not yet shown Mariabell’s full story. Season 3 introduced her as a background threat. Season 4, which starts in April 2026, will feature her as a main enemy. Fans of the light novel know what is coming. New viewers should prepare for one of the smartest and coldest villains Rimuru has ever faced.
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