Eskel

Eskel is a calm and reasonable witcher and Geralt's friend from his youth. They were raised together at Kaer Morhen and even went through the trials together. He is said to be equally skilled and as experienced as Geralt. He has a large, disfiguring scar on his face and spends winters in the Kaer Morhen keep, just like all the others. It's stated in his bio in the Witcher 3 that the scar on his face came not from a monster's claw, but from a strike made by his unexpected child.

In the short story "The Last Wish", Geralt reminisces about an afternoon with Eskel when they were young. In the novel "Blood of Elves", Triss notices that Eskel emanates even more magical power than Geralt does. In the short story "Something ends and something begins" in "Sword of Destiny", he is seen holding hands with Triss Merigold.