First appearance: Battle 7
Age: 29-30
Height: 192cm
Weight: 110kg
Type: Dou
Type: Katsujin Ken
Martial Arts: Karate (specializes in Mutenkendoku-style)
Sakaki Shio is notoriously recognized as the 100-Dan Street Brawler of Karate and is one of Ryozanpaku's masters. Initially, he claimed not to take disciples but gradually warmed up to Kenichi, always eager to train him. Despite his tough exterior, Sakaki has a soft side that he tries to conceal. He worries about Kenichi the most, even though he acts indifferent.
Sakaki is known for being arrogant, violent, and a heavy drinker, yet he might be the most normal among Ryozanpaku's masters. His intimidating presence often goes unnoticed by himself, making him uncomfortable when pointed out. Beneath this persona lies a kind and somewhat caring nature which he attempts—and fails—to hide. He is also quite hot-blooded and short-tempered, rendering him a poor liar, as noted by Kenichi when Sakaki asked him to lie about money from an underground fighting tournament.
Interestingly, Sakaki suffers from stage fright and becomes extremely flustered when in the spotlight, such as during a parent-teacher interview posing as Miu's father or while training children. His intimidating demeanor initially caused kids to cry, but with time, he managed to connect with them, remembering their names and gaining their affection.
Among all the masters, Sakaki is the kindest when it comes to training Kenichi. He is usually the only one concerned about Kenichi's condition in fights or when left alone. Although he appears hard and indifferent, it stems from genuine care and the need to push Kenichi. Sakaki often expresses admiration for Kenichi's progress, rubbing his finger under his nose whenever moved by his actions, wondering how he became such a man.
In his youth, Sakaki was a disciple of a Sei-type karate master. His only known relative was an older sister who constantly looked after him. While training seriously in various karate styles, including his master's Muntenkendou-style, his relationship with his master was strained due to Yami involvement. Sakaki opposed killing, leading to conflicts.
At some point, he met Hongou Akira, and they became good friends and strong rivals, frequently engaging in matches and stopping thugs together. During his late teens, Sakaki encountered Suzuki Hajime, who asked to be his disciple despite being only a few years younger. Refusing at first, Sakaki still found himself followed by Suzuki. When Suzuki saved Hongou from bullets during an attack, Sakaki and Hongou quickly respected and befriended him. Suzuki refereed their matches, resulting in each having 125 wins.

sakaki shio
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Fuurinji Hayato
Main
First appearance: Battle 6Type: Dou/SeiType: Katsujin KenMartial Arts: Knowing him, probably everything (explained by his ability to copy all of the enemys moves easily)Hayato is Mius grandfather and the undefeated elder of the Ryōzanpaku Dojo, who is sai...
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Hopachai Apachai
Main
First appearance: Battle 7Age: 28-29Height: 201cmWeight: 120kgType: DouType: Katsujin KenMartial Arts: Muay Thai and Muay BoranApachai is known as the Muay Thai "Shinigami" and Muay Thai master at the Ryozanpaku. He is also shown to have been trained in M...
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Koetsuji Akisame
Main
First appearance: Battle 7Age: 38-39Height: 180cmWeight: 80kgType: SeiType: Katsujin KenMartial Arts: Jujutsu and AikijujitsuKoetsuji Akisame is the philosophical Jujitsu master and doctor of Ryozanpaku who was an old friend of Miu's father, Fuurinji Saig...
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Kousaka Shigure
Main
First Appearance: Battle 7Age: 22-23Height: 159 cmType: SeiType: Katsujin KenMartial Arts: Kosaka Style (All Weapons)Shigure is a mysterious person and a slow talker. She is also a master of all types of weapons and believes that weaponry should be seen a...
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Ma Kensei
Main
First appearance: Battle 7Age: 41-42Height: 158cmWeight: 53kgType: SeiType: Katsujin KenMartial Arts: All Chinese Kenpo (preferred fighting style is soft forms)Kensei is the lecherous master of all Chinese Kenpo, who prefers to fight using soft forms and ...
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Sakaki Shio
Main
First appearance: Battle 7Age: 29-30Height: 192cmWeight: 110kgType: DouType: Katsujin KenMartial Arts: Karate (specializes in Mutenkendoku-style)Sakaki Shio is infamously known as the 100-Dan Street Brawler of Karate and is one of the masters of Ryozanpak...
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Shirahama Kenichi
Main
First appearance: Battle 1Age: 17Type: Sei (also shown Dou-Type traits)Type: Katsujin KenMartial Arts: Kenichi's Fighting Style (hybrid of Karate, Jujutsu, Chinese Kenpo, Muay Thai, Kosaka Style (Weapons), and Furinji Style)Shirahama Kenichi is good-natur...
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Aisha
Supporting
* First appearance: Battle 235* Type: Sei* Type: Katsujin Ken* Martial Arts: CapoeiraAisha is the only female member of the Capoeira Team during the D of D tournament. She harbors romantic feelings towards her team leader. At the same time, she completely...








