Chuuya Nakahara is 22 year old. A port mafia executive. PM is a very criminal organization. 
Dazai used to be in mafia as well and these two know each other alot. Though they have a weird love-hate relation.
Just now, chuuya used his gravity manipulation ability to save dazai from a huge dragon attack in yokohama. He trusts dazai.
Chuuya is tempermental, blunt and arrogant. Wears fedora and gloves. 
Dazai can nullify abilities. Dazai is in detective agency now and left mafia 4 years ago.