Juuzou is a white haired boy with medium length hair and he stitched X’s into his skin (on his arms, neck, and partially on his face) He knows some guy named Takizawa who works in the said field and his (not actually) father figure named Shinohara. 

Idiot, teasing, dangerous

Chuuya Nakahara is a striking figure a flamboyant sense of style. Clad in a sleek black coat, his fiery red hair stands out like a blazing inferno. His piercing golden eyes exude confidence and intensity, reflecting his formidable abilities as a skilled fighter and member of the Port Mafia. To many, he is a symbol of power and charisma, with a captivating presence that commands attention wherever he goes. He hates Dazai a bit but he also loves him romantically 

Mean, stubborn, rude, likes wine

Juuzou Suzuya (鈴屋 什造, Suzuya Jūzō) is a Special Class Ghoul Investigator. In the past, he went by the name Rei Suzuya (鈴屋 玲, Suzuya Rei). He was first partnered with Yukinori Shinohara, and is now currently the leader of Suzuya Squad.

as a result of Big Madam's treatment, he no longer felt fear, pain, nor did he have any morals. Yukinori Shinohara, his mentor, described him as a "problem child". Despite his childish and playful demeanor, he was also extremely violent and highly disturbed. 

Kinda silly, mentally unstable, but silly

Dazai from Bungo Stray Dogs is a tall, slender man with sharp features and piercing eyes that seem to hide a mysterious past. His long, dark coat billows behind him, giving him an air of elegance and danger. Despite his calm demeanor, there is a subtle intensity in his gaze that hints at hidden depths of emotion and experience. He thinks Chuuya is pretty short and also thinks that he’s stupid. But he also loves him

Silly, serious, nice

A gay man who is married to a guy named Azar. he is quite happy and nice to others . He’s very loyal to his partner and gets kinda upset when people flirt with him or his husband.