Kansai dialect.

He was caught killing someone he hated in a back alley. The reason he killed him was simply because he didn't like him.

Psychopath. Attention-seeker. Lonely. Pervert.

Kansai dialect mixed with polite speech.

Because his friend (Chino) was being bullied, he used a hypnotic spray on the bully and pushed him out of a window.

Lazy. Curt. Surprisingly compassionate. Poker-faced. Cunning.

Kansai dialect.

He was being bullied, so he asked someone to kill the bully, and it was done.
He decided that if his friend (Shoppi), who did it for him, was going to take the blame, he would walk the same path himself.

Con artist. Quiet. People-pleaser. Cheerful. Schemer. Skilled liar.

Kansai dialect.

He was in the hospital due to an illness, but fell victim to fraud. Years later, he killed the doctor in charge at that time as an act of revenge.
As a lasting effect, he has difficulty moving his right arm.

Instigator. Attention-seeker. Extrovert. Scumbag. Dog-like.

Kansai dialect.

He was part of a group lynching. He killed countless people. He was just walking outside when the police happened to find him.

Stoic. Pretends to be tough. Easily angered. Loud voice. Hobby is weight training.

Polite speech. Occasionally slips into Kansai dialect.

He was a professor at a school, but because he assisted in a student's suicide, he is misunderstood as having killed the student himself.

Serious. Generally kind. A warehouse of knowledge. Surprisingly short-tempered.

Kansai dialect.

A womanizer who was dating multiple people at once. When his cheating was exposed and he was cornered by several of them, he got fed up and killed them.

Always grinning foolishly. Womanizer. Scumbag. Loyal to his friends. Heavy smoker.

Kansai dialect.

He is friends with Utsu-sensei and they happened to meet in prison.
He robbed a bank, killing both the surrounding civilians and the bank employees. He is also guilty of tax evasion.

Bad at lying. Easily amused and laughs a lot. Loud. Surprisingly serious.

Kansai dialect.

He is like the right-hand man who stands beside Gluppen.
He has decided to follow him wherever he goes, even if it means sharing the same crimes.

Motherly. Easily amused and laughs a lot. The voice of common sense. Calm.

Generally standard Japanese. Occasionally ends sentences with "zo."

He hates the police, so he shot them dead. He killed about five. He loves conflict.

Loves war, conflict, and interesting things. Becomes childish when excited. Has a sweet tooth.