Going with Storyteller, above all.
But it involves everything, everything is Hand in Hand.
Supernaturals: Sorcerers, Werewolves, Daemons {Vampires}, Humans, Ghosts, Potentially Elven and Mermen.
Generations: On average there are 5 Generations.
Challenge: History, the story starts off in the Human World in 1855 Europe, England-Greece, Ireland, Germany, France, Spain, to be exact.
In another Timeless Realm filled with magic, Sort of Game of Thrones/Elder Scrolls/Final Fantasy except more of a Elizabethan-Victorian style age Magic and Modern Technology exist.
In this world I use French, Irish {Celtic}, Egyptian.
Rotational: between 28 Households, 138 characters and counting.
Legacies: Going Back to Generational and History Challenge, 5 rich young aristocrats travel from Europe to America, they set foot in what will become the Port city of Briarwood, New Hampshire {Formally was in Rhode Island}. So the 5 families built their own Mansions, and their own City, my fictional city.
Building: So I build All Sorts of Styles, my favorites are Neoclassic Mansions, Castles, Palaces, Chateaux, Lake Houses, Cottages, Chapels, Abbeys, Cathedrals.