Joanne is an homage character, a reference to Joanne Murray who writes as J.K.Rowlings of Harry Potter fame.
Joanne amassed a sizable fortune prior to the disastrous arrival of Demonkind. And when the fires of Hell first seared our world, Joanne did not shy from seeing every last coin spent on the rescue of others. Though it came late and did little against the Dark, her generosity did purchase some lives.
Joanne now sees to the allocation of defenders for Charing Cross under the mad tutelage of Lucious Aldin.