One faction I have not yet tried is the Vampire Counts, but it looks a new game must be started.
via Total War Warhammer
Introducing the daughter of the mad Count Otto von Drak, Legendary Lord Isabella von Carstein.
As a Vampire, Countess Isabella is forever at Vlad's side, feeding his ambition and teaching him the ways of the Sylvanian court and wider Empire. Isabella is Vlad's more valued confidante and the only person, living or dead, whose advice he trusts.
If Total War are victors in the Make War Not Love battle, it looks like Isabella could be arriving in the Old World...