Also! I would like to note just for the potential reference and usage during the rp. Old tomes in Witcher lore, and the story involving Leo Bonhart point to the rumors of their being Elven witchers in he School of Cat.

Particularly the Art of the head of the "Cat Witcher" denotes Elven ears and facial appearance. Although this is just something made to be uncertain in the lore, so players will always have something to speculate about in the end.