Casa di Falcorvo is set primarily in the fictional city of New Lavandon, located in a parallel dimension.
There is little set in the way of canon or story for this game, other than the name of the location and a few other little details.
The rules of the world are open for your imagination to create, and we have no issue with you "importing" your characters from other games, whether they be Path of the Vampire, Abyss, Vampires: A Dark Alleyway, or any other roleplay sites or games that are out there, such as the world of World of Darkness.
So feel free to be as creative as you want, just remember to be respectful and mindful of your fellow writers.