Izō Aiba

is a male delinquent briefly shown in Chapter 147, and later given a full introduction in the following chapter. He is a student that comes from South High. He is shown as an strong fighter with a kind personality, though it is unknown yet whether he is a contractor like Oga.



Personality
Being the leader of a bunch of vicious thugs, his personality is strikingly kind. He is congenial towards Tatsumi Oga and appears attracted to Aoi Kunieda. We soon find that his easy-going, relaxed ways are backed up by immense physical power and, being a delinquent, he is rather tough and intimidating at times and won't hesitate to use violence in situations. However, he does also appear chivalrous as he chose not to hit Nene despite her hostility towards him.

Appearance
Izō is a tall, lean-built young man. He has dark eyes and light colored hair that is somewhat slicked back, save for a tuff of hair that falls over his forehead. He dresses in his school's uniform and carries his younger sister in a small sleeping bag attached to a strap on his back.

Plot
Izō made his appearance after his fellow classmates started to enter a fight with the students of Ishiyama High and St. Ishiyama Academy, complaining that the bus that carried him to the hotel made him sick. . He was stated to be the rumored "child-rearing badass" that people have been talking about, the child actually being his younger sister, Chi. He tells his classmates not to mess with other schools but when one starts talking to loudly, he does a finger flick on the person's head and sends him flying. He apologizes to Oga and notices that he also has a child, causing him to question Oga's name. Oga gives a fake name, annoying Izō, and Aoi interferes between the two so that a fight won't ensue. He suddenly asks whether Aoi is in a relationship with Oga, which she denies, and Aiba takes this as an opportunity to make advances on her. He tries to contact her by any means, which makes Nene to show hostility towards him.

He later meets with Oga in a corridor and tries to convince him to show the way to Aoi's room, but he then notices a change in Chi and says that his sister has fallen in love with Oga' s child, Beelzebub, much to Oga's surprise.

Powers and Abilities
Izō is shown to be immensely strong for a delinquent, even being compared to the same strength as Oga. He is able to flick one of his fellow students with just his finger, and send the same student flying into a wall pillar. He carries his younger sister, Chi, over his back in a similar fashion as Oga's, but whether he is a contractor is currently unknown.