Senkouji Katsumi

Senkouji Katsumi is one of Uruma's bullies as well as one of the main antagonists of the manga Juujika no Rokunijn. He was responsible for participating in the murder of Uruma's family, fueling his desire for revenge on him as well as the rest of the bullies. He is the first target of Uruma's revenge

Appearance
Senkouji Katsumi is a teenage boy of average height and slim build, he has short, spiky black hair.

Personality
Senkouji is a violent monster who is very cruel towards Uruma. At the beginning of the first chapter, he is shown to have not only bullied him, but had also participated in the murder of his family, showing how cruel he is as a character.

Several years later, Senkouji bumps into Uruma, and when the two meet, Senkouji is seemingly friendly and kind towards him, even going as far as taking him to a coffee shop to continue their "friendship". Not trusting him, Uruma decided to spy on him during his interactions with Kuga, only to see that Senkouji expresses regret over his participation in the murder of Uruma's family. One day, in one of their interactions, Senkouji started crying in regret over what he had done to Uruma's family and seemingly saved a cat from getting hit by a truck, showing his seemingly regretful side towards what he had done to Uruma. As Uruma got distracted, Senkouji immediately knocked him out with a stone and took him to a warehouse before tying him up.

Afterwards, Senkouji not only revealed his true intentions, but had also revealed his true colors: a sadistic monster who had regretted not killing Uruma when he had the chance, as his sadistic side is emphasized through him choking a cat. After beating Uruma for a while, Uruma eventually frees himself and attacks Senkouji before tying him up and using the techniques his grandfather taught him to murder Senkouji.

Not surprisingly, Senkouji is also cowardly as he felt terrified of the torture he was put through by Uruma.

Torture and Death
After being rendered unconscious, he is stripped to his underwear and chained to the ceiling by his wrists. Uruma uses a vegetable peeler to peel away the surface skin on his chest and thighs, exposing the nerves, causing him to sweat profusely and become sensitive to even a single touch, comparing it to being scorched by a lighter. However, he is initially unaware due to being administered anesthesia. Once he realizes it, he is shot twice by a BB gun which to him, is complete agony. While the exact cause of his death is unknown, it's presumed that he suffered from extreme shock and died.