This time I got reincarnated as a Slime is an action-fantasy isekai anime with many powerful and compelling characters, from the sweet protagonist Rimuru Tempest to his friend Milim Nava, his ogre ally Benimaru, and many more. In general, this anime promotes peace and forgiveness over violence and hatred, but some characters are willing and able to kill.
reincarnated as slime has its own ranking of strongest characters, but powerful doesn’t always mean deadly or vice versa. A strong but benevolent being like Dryad Treyni or King Gazel Dwargo is not exactly mortal, but if a character combines their combat skills with the intent to kill, then they are definitely a mortal isekai anime character.
10 Yamza Was Clayman’s Loyal Henchman
Yamza was one of Clayman’s elite minions in reincarnated as slime , Season 2, and engaged Benimaru’s coalition army near the Animal Kingdom in a nighttime battle. Yamza possessed formidable skills, such as swordsmanship and the ability to make two copies of himself, and he faced Albis.
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Yamza fought with all his might to kill his enemies, but in the end he was overwhelmed, and even the power of a magic curse orb could not bring him victory. Still, it’s clear that Yamza will usually willingly kill anyone who gets in Clayman’s way, which makes him quite deadly.
9 Diablo Usually Holds Back These Days 
All in all, Diablo, Rimuru’s sinister new ally, is a deadly primordial demon who doesn’t hesitate to slay his enemies, but in recent years he’s learned to restrain himself. Diablo still has the mind of an assassin and has assassin skills to match, but for Rimuru’s sake he will hold back.
Devil, if asked, he would coldly and brutally kill anyone Rimuru commanded, even demon lords if need be. For now, the deadly devil is content to beat down Rimuru’s enemies and scare them away as a deadly demonic secretary.
8 Ifrit Is A Destructive Fire Spirit 
Ifrit is a fiery and destructive spirit that was once sealed within Shizue Izawa’s body when she was an isekai in this fantasy world years ago. Hinata, who witnessed the bombing of Tokyo during World War II, was terrified of Ifrit’s fire, but was helpless when Leon Cromwell placed Ifrit inside her.
Only Shizue Izawa and her formidable abilities can keep the deadly Ifrit at bay, a duty Shizue takes very seriously. On his own, Ifirit would rampage and destroy or kill everything around him, meaning the stakes were high when Shizue started to lose control of him later on.
7 Shizue Izawa Was Deadly To Monsters That Threatened Humanity 
This isekai world is teeming with monsters of all shapes and sizes, and many of them prey on humans, not just each other. Only elite warriors like the gentle Shizue Izawa can fight back, and for years the world has hailed Shizue as a monster-slaying hero in a cool mask.
Shizue was lethal to any monster that threatened people and their villages, and she had no mercy on them with her sword and fire-based powers. After his death, he relied on Rimuru to help keep the peace between monsters and humans.
6 Hinata Sakaguchi Will Slay Monsters In Shizue’s Name 
The stern tsundere Hinata Sakaguchi was Shizue’s apprentice, and Hinata considered Shizue a model hero and knight. When Hinata learned that her beloved mentor had been sucked in and eaten by the monster Rimuru, she swore to destroy Rimuru and his entire monster city.
Like Shizue, Hinata fights to defend humanity from monsters, but is more brutal. Hinata wielded her sword and powerful skills against Rimuru in a battle to the death, nearly killing him. Hinata would be just as deadly if she faced Benimaru, Geld, Rigurd or the others.
5 The Demon Lord Clayman Wanted To Exterminate The Monster City Of Rimuru 
In person and through his minions, the well-dressed Demon Lord Clayman posed a deadly threat to Rimuru Tempest and the entire Monster City. Unlike Carrion and Milim, Clayman despised Rimuru from the start and even refused to attempt diplomacy with him.
Clayman sent several of his allies and minions after Rimuru, and still aimed to kill. Later in Walpurgis, Clayman personally fought Rimuru and Shion and tried to kill them, but in the end he had only words and Rimuru finished him off for good.
4 The Orc Catastrophe Nearly Wiped Out The Lizard People 
The orc tribe had over 200,000 members, and after Gelmud gave their leader a name, it became the orcish mess. Now named Geld, the orcish mess grew into a hulking, deadly, eternally hungry warlord who marched through the swampy territory of the Lizard People.
The orc disaster posed a huge threat to Rimuru, Gabiru and the others, and ordinary attacks couldn’t finish it off. So Rimuru took a big risk and met Geld’s hunger with his own with the Predator ability, and he won. Following the defeat of the orc disaster, a new leader, also named Geld, took his place, Geld being Rimuru’s friend.
3 Rimuru Tempest Is Deadly When Using Megido 
The protagonist, Rimuru Tempest, does not consider himself mortal, as he is very reluctant to use deadly force, preferring to hunt his enemies with impressive displays of force. The exception was when the Church and Falmuth wiped out half of his city, for which he swore to become a demon lord.
Rimuru used the Megiddo Killing Curse and fired thousands of intense beams of light at all Falmuth and Church troops, killing them all within minutes. This death spell allowed Rimuru to harvest enough mortal souls to become a Demon Lord and revive the dead.
2 Charybdis Is An Engine Of Total Destruction 
The enormous Charybdis was a creature born from the collective evil and violence of mankind, a flying beast that roams the world, destroying and killing as it pleases. This beast also needs a host, and Phobius and Yamza were hosts at different times.
Charybdis has immense power and the will to use it with deadly force, but Rimuru wouldn’t let Charybdis destroy his monstrous city. The demon lord Milim faced Charybdis directly, and although small in comparison, he had superior firepower and destroyed Charybdis with ease.
1 In centuries past, Veldora was a living apocalypse 
Centuries ago, Veldora the Storm Dragon was a real dragon and possessed incredible power. He could devastate entire cities just for the fun of it, and the casualties were undoubtedly endless. Only the masked hero who preceded Shizue had the power to lock her in a cave.
Deep down, Veldora is still the same deadly titan of destruction, but he no longer acts like one. He is now a kinder, carefree being in a humanoid body, and is loyal to Rimuru to the end. He will fight anyone for Rimuru’s sake, but he will only kill someone on command.