It shouldn’t be surprising to many fans that Ciri is the protagonist of The Witcher 4, considering that it did feel like a natural progression of the story following Wild Hunt, but it was surprising to see her as a Witcher. To those unfamiliar with the lore and the requirements to be a Witcher, this might seem odd considering the title of the series, but Ciri being a Witcher seems to contradict the lore of the franchise, even if she has the training. Very few can become Witchers, and Ciri shouldn’t be one of those few.

https://screenrant.com/witcher-4-ciri-lore-theory-how-explainer/