There's Eris Boreas Greyrat. She is an important character as she has a complex relationship with Rudeus. She is strong - willed and her growth as a character is interesting to follow. Another one is Sylphiette. She is a friend of Rudeus and has her own story arc related to magic and her identity. Then there's Paul Greyrat, Rudeus's father, who also plays a significant role in the story, especially in terms of family dynamics.
Geralt ends up with Yennefer. Their relationship is complex and filled with passion. They have a deep connection that has been through many trials and tribulations throughout the story. They care for each other deeply despite their differences and the various challenges they face in the world of the Witcher. It's a relationship that is central to much of the story's emotional depth.