Yes, the character of Geralt has been changed in The Witcher series on Netflix, specifically by recasting the role with a different actor. Henry Cavill, who played Geralt in the first three seasons, was replaced by Liam Hemsworth starting in season 4.

Explanation of the Change

The showrunners provided a subtle and meta-approach to explaining Geralt's recasting. Season 4 begins with a storytelling device involving an unreliable narrator, which hints that the change in actor is a narrative choice rather than a continuity error. The show suggests that the new Geralt, portrayed by Hemsworth, is essentially the same character but with some narrative flexibility to account for the recast.

The series does not offer a direct in-universe reason for the change but uses storytelling techniques, like a voiceover and storytelling framing, to acknowledge the difference. The show hints at Geralt's personal transformation, injuries, and emotional changes, aligning with the actor change.

Context of Henry Cavill's Departure

Henry Cavill left the series before season 4, with speculations pointing to creative differences or issues related to the show's adaptation from the source material, but no official detailed reason was provided by the creators.

In summary, Geralt has been recast with Liam Hemsworth in season 4, and the series explains this change through a narrative device rather than a traditional in-universe explanation.