https://www.gamespot.com/articles/mark-hamill-doesnt-know-what-the-witcher-is-but-su/1100-6457205/

A TV show based on The Witcher is coming to Netflix. There is no word yet as to who will play any of the characters, and that includes Geralt's companion Vesemir. But now Star Wars actor Mark Hamill has raised his hand to play the role despite having no idea what The Witcher is.

Writer Lauren Hissrich, who recently submitted a draft of the script she wrote for the pilot, posted a series of character descriptions on Twitter. For Vesemir, she wrote that he is "fatherly," "wise," "sprightly," and "ancient." He's also a historian and keeper of secrets, she said. People on Twitter quickly realized that this also reads like a description of Luke Skywalker.