A couple of years ago I watched Ghostbusters 2 and after watching the movie decided to seek out info about Vigo the Carpathian, the tyrant, wizard, and villain in the movie. Apparently I was foolish to do so, as Viggo the Carpathian was a fictional character.
However, it's not hard to guess which historic character provided the inspiration for him, as he bears much similarity to Vlad Tepes of Wallachia.
As for cool "Belmont relatives", you've got
Jean-Paul Belmondo, a famous French movie star.