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Biographies Bio names are in original Japanese "FAMILYNAME FIRSTNAME" order.
Harumurata
	First Manga Appearance: Chapter 107 Name Meaning: Haru=springtime, Mura=inconsistency; irregularity School: Kamakura P. S. 5 Notable Features: Wears glasses
A student from P. S. 5 whom Tsunoda dislikes. When Tsunoda asks Makoto to confront Harumurata, they are instead confronted by Tsunoda's large friend, Samehara. They are later scared off by Makoto's two dogs. He and Samehara arrive at Tsujido High looking for Makoto and are scared off upon seeing Kiyoma.
Hashiri Makoto [Click for Full Biography (Spoilers)]
	First Manga Appearance: Chapter 06 Name Meaning: Hashiri=first (catch) of the season, Makoto=honesty; sincerity Gangs: Oni-baku Gumi Homeroom Class: 1-D; 2-A School: Tsujido High School Transportation: Yamaha Jog; Kawasaki Zephyr (pink; temporary) Penis Size: Monster turtle alien tortoise from outer space (Turtle-saurus) Notable Features: Big-lipped; changes hairstyle throughout series
A loyal member of the Oni-baku Gumi, although he sometimes takes advantage of the Oni-baku's pervertedness for his gain. He always has endless schemes to hook up the Oni-baku with girls Although his fighting skills are limited, he will support his friends in times of need. Previously bullied in junior high, he seeks relationships with famous people to erase his past image, thus he becomes close to the Oni-baku, especially Eikichi. He is described to have neat lips, which makes him popular with the ladies as well as being good friends with them. He eventually settles down with Mami, who becomes his girlfriend. Click For Quick-Spoilers: When the Kamakura Mad Dogs return to Tsujido High, he gets beaten by Saejima, who manipulates him into betraying the Oni-baku and leading Eikichi into an ambush. However, he was brave enough to remain loyal to Eikichi and attacks Saejima.
Mr. Hashiri
	First Manga Appearance: Chapter 107 Name Meaning: Hashiri=first (catch) of the season Notable Features: Big lipped; looks exactly like Makoto
Father of Makoto. He buys his son two dogs when he requests it.
Mrs. Hashiri
	First Manga Appearance: Chapter 71 Name Meaning: Hashiri=first (catch) of the season Notable Features: Very young and pretty
She had her son, Makoto, when she was still in high school. She hopes that her son would one day get into college and tries her best to provide him with snacks to help him study.
Hattori
	First Manga Appearance: Chapter 70 Name Meaning: Hattori=hat; hut Gangs: Yamiko-Tei Gang School: Nisi-Kamakura Trade School Notable Features: Has no eyebrows; ranked number 10 in the Yamiko-Tei Gang
A third year at Nishi-Kamakura Trade School and Kikumaru's senpai of two years. Click For Quick-Spoilers: Upon meeting Tsukai, he insults Tsujido High and the Oni-baku. He crosses the line when he calls Itou the Yamiko-Tei Gang's "yellow taxi", a girl that would get together with anyone with just one call. He gets knocked down by Tsukai, who tells him that if he wants to find Tsukai, just come to Tsujido High as he won't run away or hide.
Higashida
	First Manga Appearance: Chapter 161 Name Meaning: Higashi=east School: Asahikawa Nanryo High School
A student at Asahikawa Nanryo High who has crossed paths with Sakaki in the past. Click For Quick-Spoilers: He travels all the way to Shonan from Hokkaido and follows Sakaki to prevent him from causing trouble. He reveals to the Oni-baku the reasons for Sakaki's behaviour.
Hino Kenkichi
	First Manga Appearance: Chapter 176 Name Meaning: Ken=healthy, Kenki=devilish swordsman Nicknames: Ken Gangs: Oni-baku Gumi Rivals: Tsumoto Katsuyuki Previous School: Makino 7 Junior High School Transportation: Honda CB 400 SF (Super Four) Notable Features: Dark skinned; scar on right forehead; mohawk
A kohai of Danma Ryuji from junior high (different one to Onizuka Eikichi as he is not familiar with Ken). He looks up to Ryuji and will even go as far as beating up a passerby for bumping into Ryuji. He has a short temper and has an intense hatred for Tsumoto Katsuyuki since junior high. He is seen as trouble the moment Tsukai Tsuyoshi lays eyes on him. He is also good at picking up girls, though not at Hiroshi Abe’s level. Click For Quick-Spoilers: Sometime during junior high, Ryuji was attacked by Ken with a kitchen knife and ended up stabbing Ken in the leg before earning his respect. It is revealed that his forehead scar was given to him by Katsuyuki as a result of their intense rivalry (spawning a history of at least twenty fights, six hospitalisations and ten arrests each). He comes to Shonan looking for Ryuji and his rivalry with Katsuyuki almost splits up the Oni-baku duo. He, along with Katsuyuki, both get beaten up by Tsukai in an attempt to bring the Oni-baku back together, but by that time the gang has already made up with each other.
Hirata
	First Manga Appearance: Chapter 174 Name Meaning: Hiratai=flat; simple; even; plain Gangs: Hiratsuka Idaten Gang Transportation: Honda NS1
A member of the Idaten gang and friends with Kosaka Miyuki. He is interested in Miyajima Ayaka but she finds him boring.
Hiromi
	First Manga Appearance: Chapter 74 Name Meaning: Hiromi=wide-seeing; widespread beauty Notable Features: Girlfriend of Saejima; has her own place
Saejima's girlfriend of one month. She initially agreed to go out with Saejima because she was petrified of his scary face. Even when she got herself another boyfriend, she was still too afraid to tell Saejima the truth.
Honma Atsushi
	First Manga Appearance: Chapter 93 Name Meaning: Atsushi=cordial; industrious Gangs: K. T. Butai; Oni-baku Gumi Homeroom Class: 1-F Current School: Tsujido High School Previous Schools: Ryou Junior High School
A member of the K. T. Butai under Katsuyuki. Click For Quick-Spoilers: He, along with the other members of the K. T. Butai, target the Oni-baku and the Kamakura Mad Dogs until they discover that their leader, Katsuyuki, is a friend of the Oni-baku. He appears from time to time and is present at many of the major fights. He is one of the five K. T. Butai members that show up when Katsuyuki rounds them up to take on the Kamakura Massacre Unit.
Mrs. Honma
	First Manga Appearance: Chapter 165
Homna Atsushi's mother. She thinks that the Oni-baku is a bad influence on her son. Click For Quick-Spoilers: She tries to stop her injured son from leaving the house after he gets attacked by Yagyo Atsuki. She witnesses a second attack on her son as he tries to reveal to the Oni-baku the identity of Yagyo Atsuki.