Soul Calibur also has Darth Vader in it, those don't follow the same rules as Smash.Why do people keep pointing the fact out that Geralt came from a book series?
I don't think he is coming to Smash but that didn't stop him from Daemon X Machina or Soul Calibur.
CDPR can do with the video game likeness of Geralt what they want.
I think he is an exception compared to Goku or Vader.