The world of superhero comics is filled with tortured souls. One guy, grief-stricken after the vicious murder of his parents, dresses up as a bat to fight crime. Another similarly grief-stricken fellow dresses up as a spider. And those are the heroes.

Even in that world, the psychological profile of Harley Quinnstands out. Best known as the former girlfriend of the Joker, Harley suffers from multiple personalities, homicidal tendencies, Stockholm syndrome and possibly “shared psychotic disorder.” A survivor of domestic violence (not surprising, given her former beau), she has murdered grown-ups and kids. Her weapons of choice include mallets, baseball bats and exploding cupcakes.

Despite her mental issues and misdeeds (or perhaps because of them), Harley is having a moment. This year, she headlined three books, including a self-titled monthly comic and two six-issue mini-series. She’s a lead character on “DC Super Hero Girls,”