Home » Anime & Manga » Mairimashita! Iruma-kun » (2021) Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun Ranked

(2021) Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun Ranked

Written and illustrated by Osamu Nishi, Welcome to Demon School! Iruma-kun is one of the most popular ongoing anime and manga series. This series follows the adventures of a human through the dark world of demons called the Netherworld. Iruma Suzuki is a 14-year-old boy who, throughout his life, had to face many hardships, thanks to his good-for-nothing parents. Since childhood, he had to work multiple jobs to meet the necessities of life.

One day at his job Iruma is kidnapped by a powerful demon named Lord Sullivan as Iruma’s parents sold him for money. To his surprise, the demon offers Iruma to become his grandson or else be eaten. Owing to no choice at all, Iruma agrees. Iruma is enrolled into the prestigious Babyls High School for demons, where he decides to keep a low profile.

However, this is next to impossible as his grandfather Lord Sullivan is the principal of the school, and by virtue of being his grandson, he unwantedly became the center of attraction. Thus, from here starts his journey in the demon world. As Iruma-kun navigates through the various oddities of the demon world, it often leads to many comical and embarrassing situations. Here we will take a look at the top 20 strongest characters in Welcome to Demon School! Iruma-kun.

Warning, Spoilers Alert for Anime Lovers. This post contains some characters which are not introduced in anime till now.

Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun-

  • 20. Amy Kirio-
Strongest Characters in Welcome to Demon School! Iruma-kun
Image Source: Mairimashita! Iruma-kun Wiki – Fandom

Kirio is a third-year student at Babyls High School for demons and the head of Magical Apparatus Battler. He has one of the darkest and twisted personalities ever. He is a sadist who loves to see others in despair. Since childhood, he had a weak affinity towards magic and often coughed out blood while casting spells. Though a Rank 2: Beth, he inherited the powerful barrier magic of his family, giving him zero offense skills but 100% defense skills.

He was the one who decided to destroy Babyls and is secretly working with Baal to destroy the current order in the demon world. His barriers have the ability to regenerate and can only be destroyed by Rank 10: Yod class demon. Iruma was able to break through his barriers only by unleashing the true potential of Sullivan’s magic stored in his ring. Kirio considers Iruma his arch-nemesis and, in the current arc, is one of the main antagonists.


  • 19. Sabnock Sabro-
Strongest Characters in Welcome to Demon School! Iruma-kun
Image Source: u/doctorgecko (Reddit)

He is one of the demons of the Abnormal Class and is Iruma’s classmate. He is a highly muscular bloke whose only ambition in life is to be the next Demon King and believes that his every action, no matter how silly, is necessary to achieve this ambition. On the very first day of the enrollment ceremony, he attacked a teacher to showcase his strength. Sabro possesses immense physical strength and agility. He inherited his Bloodline Magic: Weapon Creation, which allows him to forge a weapon through any kind of metal within a matter of minutes. Currently, he possesses Rank 4: Daleth.


  • 18. Orobas Coco-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: onimanga.com

Orobas is a student of Babyls High School and his character was introduced during the Harvest Festival arc. He is a student who always strives for first place but to his dismay always ends up being in second place. He inherited the Orobas’ family bloodline magic: Trauma. It is a powerful spell that creates an illusion of the enemy’s greatest fear. Hence, the more the fear more deadly will be the effect of his spell. He came second during the harvest festival and earned Rank 3: Gimmel.


  • 17. Asmodeus Alice-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @pinkgirlsdaily (twitter)

Asmodeus Alice is one of the main characters of this story. Initially, in the series, he was portrayed as a brash fellow who challenged Iruma for a duel on the very first day of school. On losing to Iruma there is a 180-degree change in his behavior and he becomes a loyal companion of Iruma. His only desire is to be the right-hand man of Iruma and always be by his side. He is immensely powerful and his mother is a member of the ’13 Crowns’- a body of powerful demons who controls the demon world. Alice can manipulate fire and can cast very powerful spells. His powerful flames offer him both offensive and defensive capabilities.  Presently, he possesses Rank 4: Daleth.


  • 16. Rovone Lomiere-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: u/BadVideo_Man (Reddit)

Rovone is a highly loud and pompous fellow. He heads the Discipline Council at Babyls High School and his only ambition in life is to replace Azazel Ameri as the next President of the Student Council. He loves to stand out. His bloodline magic: Attraction, allows him to attract the attention of all the individuals up to a certain distance. People are mesmerized by his spell and do as he says. Currently, he possesses Rank 5: He.


  • 15. Iruma Suzuki-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image source: u/Louro26 (Reddit)

Iruma is the main hero of this story. He is a person who can simply never say ‘no’ and ends up helping others no matter the situation. Owing to his rough childhood, he has developed ‘Overwhelming Crisis Evasion Capability’ which helps him to avoid danger at any cost. It is his ultimate defense technique that makes it almost impossible to hit Iruma. Though, a human in a world full of demons his blood is a highly valuable commodity. His blood can heal wounds and accelerate growth at monstrous velocity. He also possesses the ‘Ring of Gluttony’ which allows him to use Lord Sullivan’s deadly powers. His spells like ‘pandora’ and ‘libera’ are to watch out for. Under the training of master Baciko, he has become a talented archer. He currently possesses the Rank 5: He.


  • 14. Azazel Ameri-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @Barp (Pinterest)

She is the President of the Student Council at Babyls High School. She has a strong intimidating presence and is a strict disciplinarian. She has a cold exterior and hides her love for romance novels from everyone. Her aim is one day to assist her father in the Demon Border Control. She is a highly ambitious girl who instills the desire to climb ranks in Iruma. Ameri is Rank 6:Vav and is immensely powerful. She inherited the Azazel family bloodline magic: ‘Delusions’ which helps them to draw out enormous strength without restraints only if they believe they possess it. She helped Opera to take down the miscreants in the Walter Park Arc.


Top 15 Best Love Anime to Watch With Your Girlfriend/ Boyfriend
Image Source: recommendmeanime

Must Read- (2021) Top 15 Best Love Anime to Watch With Your Girlfriend/ Boyfriend


  • 13. Furfur-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @justagender (tumbral.com)

He is one of the professors at Babyls High School. He was tasked to train Allocer and Jazz of the Abnormal Class during the Harvest Festival Arc. He possesses extraordinary agility and sleight of hand which comes into play during gambling. The true nature of his powers is yet to be revealed.


  • 12. Velar-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: mairimashita!iruma-kun.fandom.com

She is one of the professors at Babyls High School. She was tasked to train Agares and Gaap of the Abnormal Class during the Harvest Festival Arc. She is a highly shy person who always keeps crying. Her tears are the source of her power as her bloodline magic gives her water manipulation abilities. She forms powerful currents of water using these abilities.


  • 11. Raim-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @MILK (Pinterest)

She is one of the professors at Babyls High School. She is a powerful Succubus demon who teaches an all-girl seduction class at the school. She has the ability to charm people an exclusive power to her demon kind only. Once charmed, they are a slave of her will and are ready to do anything as he says. She also possesses Ero Scope –an ability that gives her power to visualize the sexiness quotient of a human being.


  • 10. Barbatos Bachiko-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @A.K. Dimensions( Pinterest)

She is one of the professors at Babyls High School. She is a boastful woman who gets easily pissed off if things are not done her way. She was tasked to train Iruma during the Harvest Festival Arc. She discovered Iruma’s innate talent for archery. She possesses the Barbatos family bloodline magic: Full marks which allows her to draw out a powerful bow. The arrow shot from this bow always hits the target by overcoming any barriers or restraints.


  • 9. Balam Shichiro-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @UncleGeorgie2 (imgur.com)

He is one of the professors at Babyls High School. He is a towering muscular giant. Despite his terrifying looks, he has a gentle heart. He is extremely fascinated by the human world or any unknown mystical creatures. On discovering that Iruma is a human, he helped him to understand the oddities of the demon world and helped him from time to time. He uses both brawn and brain to fight battles. His bloodline magic: Buzzer helps him to sense any kinds of lies or wrongdoings. He possesses a Rank 8: Chet in the demon ranking system.


  • 8. Naberius Kalego-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @Vhyserion(deviantart.com)

He is one of the professors at Babyls High school and also the homeroom teacher of the abnormal class. He is a strict disciplinarian with a cold-hearted exterior. He is quite short-tempered but deeply cares for his students. He is a powerful demon and currently possesses the Rank 8: Chet. He was the only demon whose magic was able to destroy Kirio’s barriers though only momentarily. His familiar Cerberus Butte is immensely powerful and can destroy anything in its path.


  • 7. Opera-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: anisearch.com

Opera is the right-hand man and the most trusted companion of Lord Sullivan. He is responsible for the security of Lord Sullivan and also takes care of Sullivan’s household. Before this, he was a student at Babyls High School. He was the senior of Kalego and Balam sensei. Opera possesses immense strength and has sharp reflexes. During the Walter Park arc, he defended the students single-handedly with ease.


Top 20 Best Manga for Beginnersuni Kenshin
Image Source: wallpaperflare

Must Read- (2021) Top 20 Best Manga for Beginners of all Time


  • 6. Baal-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @sonofrudd (twitter)

Baal is one of the members ’13 Crowns’ (an organization of immensely powerful demons who controls the demon world) and is known as the ‘Lord of Thunder’. He has the ability to manipulate lightning and delivers strong blows to his opponent using the same. He was a student at Babyls High School and was the founder of the Magical Apparatus Battler. He along with Kirio is currently hatching a sinister plan to overthrow the current order in the demon world.


  • 5.Azazel Henry-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: mairimashita!iruma-kun.fandom.com

He is one of the members of ’13 Crowns’ and the Security Chief of the Demon Border Control. He is responsible to maintain the law and order in society. He is the father of Azazel Ameri and has inherited the Azazel family bloodline magic: ‘Delusions’ which helps them to draw out enormous strength without restraints only if they believe they possess it.


  • 4. Lady Levi-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: @Thay (Pinterest)

She is one of ‘The Great Three’ along with Lord Belial and Lord Sullivan who possesses the second-highest Rank 9: Tet. She is one of the candidates for the next Demon King. She is one of the most influential and powerful demons in the Netherworld. The true nature of her powers is yet to be revealed.


  • 3. Lord Belial-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: mairimashita!iruma-kun.fandom.com

He is one of ‘The Great Three’ along with Lady Levi and Lord Sullivan who possesses the second-highest Rank 9: Tet. He is one of the candidates for the next Demon King. He is one of the most influential and powerful demons in the Netherworld. The true nature of his powers is yet to be revealed.


  • 2. Lord Sullivan-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: u/doctorgecko (Reddit)

Lord Sullivan is one of the most powerful and influential demons in the Netherworld. He hides his menacing personality underneath his jolly and eccentric side. All the demons in the Netherworld think thrice before angering him. Lord Sullivan is part of ‘The Great Three’ beside Lady Levi and Lord Belial. The three of them hold the second-highest rank of Tet and are candidates of the position of Next Demon king – the Lord of the entire Netherworld. Sullivan served Delkira-the previous Demon King during his reign. Lord Sullivan is an enormous storehouse of power and knowledge. He has a strong affinity towards magic and possesses the ability to manipulate time and gravity.

Strongest Character in Welcome to Demon School! Iruma-kun-

  • 1. Delkira-

    Top 20 Strongest Characters in Welcome to Demon School! Iruma-kun
    Image Source: tumblr.com

Delkira was the previous Demon King who has been missing for many centuries. In the manga, it is known that he possessed the highest rank of Yod. However, the nature and extent of his powers are not yet revealed.


Special Mentions-  

  •  The Thirteen Crowns-

The Thirteen Crowns is the governing council of the Netherworld which comprises of the most powerful demons of the society. All the members of this council have not been revealed and little to almost zero information is known about many of them. As the story progresses further, one has to wait in order to know the true extent of their powers.


Best Succubus Anime of all Time
Image Source : wall.alphacoders

Must Read- Top 20 Best Succubus Anime of all Time (2021)


Presently, in the ongoing arc ‘Six Fingers’- a group of 6 powerful miscreants is the main antagonist under the direct command of Kirio. In the latest chapter, ‘A Gathering of the Heroes’- a meeting is conveyed of the 13 Crowns. The Great Three have nominated their respective grandchildren as the candidate for the future Demon King. Iruma-kun, by virtue of being Lord Sullivan’s grandson, is also a candidate for the throne of the Netherworld. One can only anticipate what will happen next. One can read the manga for free at mangafreak and can enjoy the entire first season of Welcome to Demon School! Iruma-kun on Netflix.


Follow us on Twitter for more post updates.

Also Read-