Lord Sullivan runs the prestigious Babyls Demon School in Welcome To Demon School, Iruma-Kun! Ranks are assigned to students at the academy, helping the demons rank up and display their bloodline magic. Basically, bloodline magic refers to the special abilities a demon inherits from their ancestors, so each individual has their own magic.
A total of 666 students attend the school, and all kinds of teachers are there to protect and teach them how and where to use their demonic abilities. Moreover, the professors train and guide the students to enhance and upgrade their bloodline magic. However, because bloodline magic is an inheritance, some students are lucky since they are born into powerful bloodline families. This ensures them a powerful quirk that sometimes surpasses their teachers'.
6 Weapon Creation (Sabnock Family)
The Sabnock's bloodline magic allows them to create weapons or shields from any material they bite into, like gold, silver, copper, and more. Sabro Sabnock wears a necklace with three materials, while his father has five materials, and his sister Silvia has a single silver pendant. During unfriendly battles, the family uses these necklaces to assist them in forging weapons quickly.
As Babyls campus' hunk, Sabro Sabnock is a reckless, loudmouth demon. He is one of the most brilliant Misfit Class students. However, he sacrifices his intelligence in order to maintain his cool image. Sabro is one of the few students who genuinely wants to be the Demon King; therefore, he views Iruma as his rival.
5 Romanticist (Azazel Family)
The Azazel Bloodline magic is the Romanticist (King of Delusions), which gives its holder a power that draws out the maximum strength of its holder as long as they believe they have that strength.
The Romanticist bloodline magic is a double-edged sword since it relies mostly on one's strong will and beliefs. If one cowers or fears their opponent, they cannot use this ability. Furthermore, this inherited skill has a side effect on the holder's body, since as soon as it wears off it causes immense pain.
4 Summon (Clara Valac)
Summon (Toy Toy) is the specialty of the Valac family, which can magically produce any item the holder imagines, no matter how big or small. Clara Valac uses her inherited skill after tapping her pockets twice. However, the family cannot summon magic items as the Toy Toy bloodline magic depends on the holder's imagination and mana quantity.
Due to Clara's childlike character and careless nature, her imagination is unlimited. However, she needs help understanding the creation of complicated objects like magic items which is why this bloodline magic can be limited to some of its holders.
3 Bullseye (Barbatos And Bars Family)
The Bullseye is split into two types of abilities. The first is Full Mark, a rare bloodline magic that only three demons of the Barbatos family inherited, such as Bachiko Barbatos. Full Mark gives its holder the power to manifest a unique bow that shoots 100 arrows simultaneously. This inherited skill is only used by the Barbatos lineage and can be hard to pass down to others as it requires a lot of practice, and the demons aren't patient creatures.
Other than that, the Bars family, such as Robin Bars, uses the One Hit Bullseye. It grants the holder the ability to manifest a green Phoenix Bow that shoots one arrow at a time. Both skills' arrows are unstoppable in terms of barriers until they reach their target’s bullseye. However, the One Hit Bullseye bloodline magic is limited to one use per day as it is weaker than the Full Mark, which can be used more than once.
2 My Area (Agares Family)
My Area (Bed) is a hidden power among other bloodline magics. This hidden gem gives the ability of earth manipulation and the power to sense mana, vibrations, or any activity inside the earth. Picero Agares, a lazy demon who dislikes unnecessary interactions, uses this earthly power. However, despite his laziness, he can easily tear up an enormous part of the earth with just one move.
This bloodline magic is known for its variety of uses, as it can not only manipulate the earth but also have the power to manifest floral and control dust particles. As seen after the Harvest Festival, Picero’s bloodline magic gets enhanced, and the lazy male acquires the Green Thumb ability.
1 Cerberion (Naberius Family)
Ceberion is the magic of the Naberius family. It's arguably the strongest blood-related magic in Welcome To Demon School, Iruma-Kun! As it is bound by mana with Cerberus, the three-headed demon dog. This bound bloodline magic gives the family the disadvantage of not being able to summon a Familiar since the demon dog chases them away. As for the advantage, they can summon Cerberus as a three-headed or single-headed demon dog whenever it is needed.
The demon dog is a vicious beast that will bear its fangs at anyone it doesn't acknowledge as its master. Furthermore, Cerberus is always surrounded by a yellow aura that makes it seem incomparable to other creatures in the Demon World. The assertive demeanor the dog emits makes other Familiars cower at its presence, which makes it the strongest and most intimidating among them all.