Well, if it's about Tohru Adachi from Persona 4, his back story involves him being a police detective in Inaba. He was transferred there from the city. He felt bored and unfulfilled in the small town life at first. As the story unfolds, we learn that his envy and sense of being an outcast in his own life led him to make some very dark choices. He gets involved with the supernatural events in Inaba in a rather twisted way, which ultimately has a huge impact on the other characters in the game.
In Adachi's back story, his role as a detective is important. He used this position to cover up his actions. Also, his feeling of being an outsider in Inaba pushed him towards the dark side. He felt that he didn't fit in the small - town life, and this led to his involvement with the supernatural events in a negative way. He saw the power of the Shadows and the TV World and decided to use it for his own gain, rather than trying to protect the town like the other characters were attempting to do.
I think the Persona 3 manga is good. It has an interesting premise and the illustrations are top-notch. There are some minor flaws, but they don't overshadow the overall quality.
Persona 5 indeed has a manga. It retains the core elements of the game while presenting the story in a visual format that suits the manga medium. Many fans appreciate the manga for its unique take on the familiar Persona 5 universe.
I don't have the exact details on how far along the Persona 5 manga is at the moment. Usually, you can find this kind of info on official manga publisher websites or from manga enthusiasts' discussions on various online communities.