One common theme is power. Yennefer is a powerful sorceress, and many fanfictions explore how she wields her power, whether for good or bad. Another theme is love, especially her relationship with Geralt. It could be a passionate love or a complex, love - hate relationship.
Love and relationships are also common. Whether it's her relationship with Geralt or other characters, fanfics often focus on the emotional aspects of her connections. For example, some fanfics show her learning to love and be loved in a more selfless way.
One key element is her difficult childhood. Her physical deformities made her an outcast. Another is the discovery by Tissaia, which was a turning point. Also, her transformation at Aretuza through magic is crucial.
Well, Yennefer's origin starts with her difficult beginnings. She came from a less - than - ideal background. Her physical appearance was not what society considered normal at that time. However, magic became her way out. At Aretuza, she faced many challenges. For instance, she had to learn to control her newfound powers. The origin story is also about her struggle against the prejudices she had faced before and how she overcame them through her magical prowess and strong will.
Triss and Yennefer have a complex relationship in the Witcher universe. They both have connections to Geralt and their interactions are filled with jealousy, rivalry, and occasional moments of understanding.