Originally Posted by Maylander 
CDP does not control or own The Witcher though. The author (Andrzej Sapkowski) does, and so far the whole series (books, that is) has been about Geralt as far as I know. Simply adding another main character is not up to CDP at all, it's up to Sapkowski.
What… gave you this idea?
Sapkowski - an antisocial grump - doesn't give a damn about The Witcher games and he never influenced development in any way.
Actually, he despises them a little bit. And I can't blame him for that. The Witcher games may be ambitious and fun but… Gerlat has never been a jedi knight with time stopping spells and fireballs, living in a high fantasy world. Gaming industry has a weird definition of "faithful adaptation".