Kim Newman on appropriating characters and plots, particularly vampires but plenty of others, in his Anno Dracula series and elsewhere.
I’ve talked about using Dracula or a similar fictional superstar before. Of course, at the moment there are four or five spins on Dracula coming to TV and films - enough that everybody at the table could play a version of him.
Obscure gamer footnote - Newman’s heroic vampire Genevieve is also lifted from another text. She first started out in Drachenfels, a Warhammer novel he wrote as Jack Yeovil. Which is itself full of odd references.