Halley is a supervillain, and the second half of Team Trepanner. He an his partner Artemis dabble in petty crime and mayhem, usually bank robbery, destruction of property, and just being annoying in general. While Artemis is both the brawn and brains of the team, Halley is... the lightshow, I guess?
Prada is also a petty criminal, though in this case his deal is stealing fancy cars. He got caught and served 15 years in prison for it, missing most of his young daughter's childhood. As a result of the social ostracization that she was familiar with in her childhood, of other kids knowing her dad was a prisoner, Armani also turned to crime to "get back" at her parents.
Nana just loves to steal from Hot Topic, which is really the least of his offenses, the foremost of which is "existing."