Yōhei Nasu

, also referred to as, is a freshman at Ishiyama High School. He is formerly from Sōrei High School.

Appearance
Nasu is a very tall, lean-built and muscular young man with droopy eyelids. He possesses blond hair and gray eyes. Particularly, his frizzy hair is predominantly swept back, causing most of the strands to shoot up; thus, giving him a "wild" look.

Nasu wears hoop earrings on both ears and he also has a round stud piercing on his tongue. He also likes to wear necklaces; currently, he is shown to have at least two, with one being dark and holding a cross pendant, as well as another chained necklace that has a round pearl-like object on the end.

His usual outfit consists of the uniform worn by the Ishiyama High School males, which is a combination of a dark-colored jacket possessing five round buttons, with long sleeves and a short collar, as well as dark-colored pants. Nasu usually wears a light-colored shirt underneath his open jacket. Currently, he is shown wearing a horizontally-striped shirt, as well as one having a distinctive bull's eye, where Nasu's left pectoral muscle will be, with an arrow below pointing up to it. Nasu also wears light-colored shoes. Underneath his shirt and jacket, he evidently wears light-colored with a small suction circlet attached to his his pectoral muscles, just above his nipples.

Nasu has recently obtained three childishly-drawn whisker markings on both of his cheeks after Baby Beel drew on them, which he has yet to remove since then.

Personality
Nasu has a cheerful, carefree and somewhat flamboyant attitude. He often jokes with others even after provoking them in a certain nature, which is heavily evident with Nasu's habit of sticking out his tongue and squirrel-like grin.

However, despite Nasu's genuine demeanor, he can be very sarcastic to the point where it becomes mocking; nonetheless, he retains a cheerful attitude and is depicted as being childishly innocent when doing so occasionally. He has also shown that he can be rather intimidating and somewhat vicious, giving Baby Beel a dark smile that frightens the infant and coldly telling two of the "Three Kings" that there is such a difference between them all.

History
Nasu was a student from Sōrei High School before he transferred to Ishiyama High School.

Return to Ishiyama High School Arc
While Nasu is sneaking up behind Kanzaki and his gang, he is unexpectedly punched by Oga and sent crashing into a concrete wall, effectively being buried within it. However, sometime before he is hit, Nasu manages to draw over Oga's Zebul Spell tattoo, referencing his name in it. After some time, he starts breaking free from the concrete wall until he is finally released from the hard material, albeit with a large chunk of the building destroyed and a smaller portion stuck around Nasu's neck. He introduces himself to Kanzaki and his gang.

Nasu immediately targets Kanzaki and begins attacking him with a whirlwind of powerful kicks; eventually, he deals a hard blow to the senior, which renders him unable to continue fighting any further. Nasu stands over the defeated Tōhōshinki and mockingly asks whether someone like him is actually very weak and pathetic. Bored, he tells Onizuka that he can fight one of Kanzaki's underlings as long as he goes easy. Later, after Shintarō Natsume demonstrates his raw strength against Onizuka himself, this brings excitement to Nasu and he requests that they "play" together. He is refused, however.

Nasu does not become disappointed due to Oga's and Baby Beel's unexpected arrival which immediately draws in the former's attention. When asked about the markings over Oga's tattoo, he admits that he may be responsible; however, after Nasu then revealing his name and leadership status to Oga, he asks whether Oga liked his "autograph", indirectly confirming that he is the one who drew on Oga's Zebul Spell. Moreover, Oga's punch has made it tiring for Nasu, which is why he left a marking afterwards. After his cheeks are unexpectedly drawn over with, he is told that he can give Oga a free punch for earlier; though he admits that it is a bad idea, Nasu goes ahead and punches Oga anyway, forcing him up in the ceiling and burying him in the concrete. Nasu smiles gleefully upon his action. He proceeds to mockingly ask Oga whether he is still alive and later if he can even hear his voice.

Shortly thereafter, two of the "Three Kings", along with their respective gangs, arrive in the hallways to confront Nasu: Ebian Ichikawa and Kankurō Akahoshi. Nasu tries reasoning with them both until Oga, who is still stuck in the ceiling, speaks out that he will beat up all of them. Nasu sarcastically tells him to speak up. Instead, Baby Beel pops out from the ceiling and angrily points at the delinquents below. Ichikawa comments on how cute the infant is; likewise, Nasu also finds the infant to be cute, and he shoots an intimidating smile at Baby Beel. Moments after, Oga breaks free from the ceiling and lands on the ground, holding Baby Beel in one hand. The child-rearing gang leader asks how much Nasu knows; due to the vagueness of his question, Nasu instead asks about what he is referring to.

Before either can say anything else, Ichikawa suddenly slashes at the concrete around Nasu's neck, cutting it into several pieces and rendering Nasu free. When Ichikawa and Akahoshi start fighting each other, they are stopped by Nasu who, evidently "awake" now, slams them both on the ground. He tells the two "Kings" that the differences between him and them is wider than the Grand Canyon. Before anything else happens, Oga punches the wall and destroys a large chunk of the building, annoyed that they have seemingly forgotten about him. Nasu is impressed by Oga's strength and mentions how it must be because of the child on him; dismayed about not having one himself, he complains loudly.

Suddenly, Shioiri and the other Poltergeists arrive in the hallways; apparently, Nasu has missed band practice today. Nasu exclaims how they've come to pick him up and tells Oga that they will have to put their feud on hold. Before he leaves, he tells Oga that they will target everyone who came back from Saint Ishiyama, and that he will personally see to Baby Beel being taken away from his adoptive father.

After some time, Nasu tells the other Poltergeists that they will take down Oga and his friends tomorrow during fifth period.

The next day, while inside a seemingly empty room, a shirtless Nasu stretches his arms with a flower in his mouth and tassels dangling from his pectoral muscles. When Hajime Kanzaki and Takayuki Furuichi suddenly burst into the room, where they discover that the other Poltergeists are present, Nasu gleefully greets the two delinquents. Nasu tells Kanzaki that the reason why they are all there is because they are the Poltergeists, referring to their sudden appearances as "magic". An unusual horn-like marking appears over Nasu's left tassel as he says that.

Nasu stands by and watches as Kanzaki attempt to knock out Shioiri, only to be pushed back and be stomped on his stomach. He looks at Kanzaki's seemingly defeated body and mocks Oga for being a "bad leader" despite having Baby Beel. Nasu is then told by a bloodied Kanzaki that he shouldn't underestimate Oga. Suddenly, Oga then bursts through the door with Baby Beel on his shoulder. Nasu tries to tell Oga that he can only make that sort of entrance so many times; before he can finish speaking, he is told not to underestimate Oga's Kamikaze captain, since he is not yet defeated.

Powers & Abilities
Hand-to-Hand Combatant: Nasu is shown to be a very capable fighter with an unorthodox style based around punches and kicks. Using his particular speed and flexibility, he can easily can easily knock down formidable opponents, particularly those of Hajime Kanzaki's and Tatsumi Oga's caliber. He easily defeats Kanzaki, who is a fighter well-known to use a particular drop kick style, with just a few powerful kicks to the body; moreover, while performing such kicks, Nasu is able to use both legs while midair with very accurate coordination, despite the fact that he would be unable to see his feet in the position and situation that he is in. In a related fight against Oga, Nasu kicks Oga a fair distance away, only to jump back on him with a powerful punch. Regarding punches, he is also rather skilled in the style. He is able to deal a powerful uppercut to Tatsumi Oga and literally bury him in the concrete ceiling from one of Ishiyama's buildings, showing relative ease upon conducting the act. In a continuing battle, Nasu has been shown being able to conduct multiple punches to his body in a very rapid amount of time. Enhanced Strength: Nasu is very resilient. Despite his head being buried through a concrete wall, he is able to push himself out, as well as destroy a large portion of the wall without further inflicting any damage to his own body. Moreover, he can easily flip over two teenagers close to his own size using only two hands, one for each.
 * An evident rip-off from a technique in Fatal Fury, particularly from the playable character Howard Geese, as noted by Akahoshi. Nasu grabs the fists of two people and as he moves his arms, only to then swing them down in a cross-like formation, he flips the two people over and slams them on the ground.

Enhanced Speed: His range of speed is more advanced than that of a regular Human; when in a more normal situation, he is shown to be abnormally quick, especially proven in a fight against Tatsumi Oga. He instantaneously moved back to Oga's side after having previously kicked him away.

Enhanced Flexibility: Nasu, even without the use of his Demon's power, is an unusually flexible man which has proven to be a strong point in his equally-unorthodox method of fighting.

Tatsumi Oga
After experiencing a trademark attack from Oga first-hand, which Nasu later regards in the same light as one unfavorable, he has since looked down upon the child-rearing gang leader; as a result, he often speaks to him in either a very sarcastic or mocking manner. Moreover, he considers Oga to be a bad leader, due to apparently being unable to keep his fighters as strong as they can be, which Nasu believes is evident in Kanzaki.

Baby Beel
Nasu displays an unusual interest in Baby Beel, which is explicitly stated when Nasu says that he will take the infant away from Oga. He considers him to be very cute and has nicknamed him "Lil' Beezy". Nasu also thinks highly about Baby Beel's powers and bemoans the fact that, while he himself does not have such an infant with him, the one that Oga has appears to be wasted upon him.

Quotes

 * (To Tatsumi Oga): "We're going to have to put this on hold for today. But watch your backs. From here on out, we're gonna be taking down all you guys from Saint... and in the end, we'll take that baby from you."