Play the first stage of Vampyre: Master of Darkness for the Sega Master System. The boss strongly resembles him.
I never got the hype about this character tbh. Some guy who hangs out in dark places and plays a piano (abridged version of course) I would be much more afraid of Wolfgang Krauser or OOT Ganondorf if his "organ" is his best weapon 
If you've read the book (or seen the musical-- he actually translated pretty well to it), the guy is a genius manipulative and seductive mastermind, cunning duelist with a blade, fond of traps (both physical and psychological), and snappy dresser who could easily be just as dangerous as Dracula himself, and without using any supernatural tricks to boot. Everything Erik pulls is either psychological or practical, but it makes him
seem supernatural, especially to victims who were already ready to believe that he was.
He was basically Batman before there was even Batman.
Sadly, a Belmont would likely fall into that same trap (at least for a time) because so many of Dracula's servants ARE supernatural.
Furthermore, Dracula could lure a guy like Erik to his side pretty easily by promising him a new world where he'd be accepted despite his disfigurement. I mean, there's a reason Dracula never has a shortage of human followers after all.
So anyway, that's how I thought he might figure into the games. He'd probably be a character like Olrox, who has his own portion of the Castle, one laden with traps and confusing/misdirecting stage design and a whole lot of secret passages and rooms where you could find loot squirreled away.
The boss fight would be a straight up duel, I think. Demon form courtesy of Dracula optional.