Mikan Tsumiki - Due to mass amounts of bullying, her self-esteem dropped, becoming a stuttering and sobbing mess.
Shuichi Saihara - Due to solving a past case he didn't intentionally solve, he feels scared to face the truth due to arresting a killer who was trying to help their family.
Ryoma Hoshi - Due to getting arrested for killing the mafia that killed his family and girlfriend, he has become a depressed man who tells people that they shouldn't approach a killer like him. Despite that, he's willing to sacrifice himself to save someone!
Heavy Weapons Guy - His father was an anti-revolutionary who opposed the communist uprising, he ends up being executed. Heavy's family was taken to a Gulag for 3 months before it was burnt down in 1941. Heavy became a mercenary to provide for his family.