Radmir was a gang member in his previous life. He was betrayed and tossed out of gang (hence he has his finger cutted off). Gang was falling apart.
Somehow he was resurrected by his previous colleague. This guy never was in good terms with Radmir, but they felt regret towards his death. Now they are working out how to secure previous members of their group.

Where was a particular reason(s) why Radmir was killed: 1 - he is too loyal to the gang 2 - he is too unhinged to be controlled. Radmir has questionable morals and no pulls. Even now, as a fragile creature, he is searching for gang's betrayers to avenge his death and gang's falling.  

He prefer flashing and intimidating clothes (but maybe they are too edgy to be scary lol)