J doesn't get much attention lol but if she was persuade by Uzi or N to be not as evil she would be a very bubbly character, at least I think- her personality was kind of bubbly to me if you watch the first episode.
My brain has allowed me to experience large amounts of serotonin and dopamine, as I have been informed that those two chemicals, along with two other, making four in total, responsible for happiness, Rock and Stone!