1. The character of Dracula in Castlevania, while inspired by the books is not the same as the Dracula from 1897. They are worlds apart; and nothing can change that fact. Arsene also originated from short stories, but don't try to convince me that Joker's Arsene is anywhere close to the Arsene in the stories.
2. Regardless of what the original author says, The Witcher games try to follow the details established by the books very closely (within reason). They aren't inspired by the books, but rather based on the books themselves.
3. Arguing Geralt could be in Smash does open up a ton of flood gates in "who" can be in Smash.
For example (Just some examples):
Batman could technically make it in because Arkham Asylum Batman is from Video games and not books.
Might as well consider Epic Mickey too, considering that he's a game character.
Let's throw in Goku because FighterZ isn't canon to the manga, and is in fact very much it's own video game centric thing. I guess Sakurai can add Goku after all!
So in short, the Dracula argument is irrelevant unless you can somehow give proof that Castlevania Dracula is the very same as the books.
