
Geralt of Rivia
Geralt of Rivia was a legendary witcher of the School of the Wolf active throughout the 13th century. He loved the sorceress Yennefer, considered the love of his life despite their tumultuous relationship, and became Ciri's adoptive father.
During the Trial of the Grasses, Geralt exhibited unusual tolerance for the mutagens that grant witchers their abilities. Accordingly, Geralt was subjected to further experimental mutagens which rendered his hair white and may have given him greater speed, strength, and stamina than his fellow witchers.

Ciri
Cirilla Fiona Elen Riannon (better known as Ciri), was born in 1252 or 1253, and most likely during the Belleteyn holiday. She was the sole princess of Cintra, the daughter of Pavetta and Emhyr var Emreis (who was using the alias "Duny" at the time) as well as Queen Calanthe's granddaughter.
After Geralt of Rivia helped lift Duny's curse, Duny asked what reward the witcher would like and Geralt proclaimed the Law of Surprise, as it turned out Pavetta was pregnant with Ciri, unbeknownst to Duny.

Yennefer
Yennefer of Vengerberg, born on Belleteyn in 1173, was a sorceress who lived in Vengerberg, the capital city of Aedirn. She was Geralt of Rivia's true love and a mother figure to Ciri, whom she viewed like a daughter to the point that she did everything she could to rescue the girl and keep her from harm.
She helped advise King Demavend of Aedirn (though was never a formal royal advisor), a close friend of Triss Merigold, and the youngest member of the Supreme Council of Sorcerers within the Brotherhood of Sorcerers. After its fall, the Lodge of Sorceresses attempted to recruit her, but they didn't see eye to eye as the Lodge wanted to advance their own political agenda by using Ciri.

Triss
Triss Merigold of Maribor was a legendary Temerian sorceress of the 13th century. Called Fourteenth of the Hill by her contemporaries because she was erroneously thought to have been killed during the Battle of Sodden Hill, she passed into history as Merigold the Fearless. A member of King Foltest's royal council along with Fercart and Keira Metz, as well as a founding member of the Lodge of Sorceresses, she was involved in politics for most of her life.
She was friends with Yennefer and the witcher Geralt of Rivia, but also unhappily in love with the latter. Triss took care of Ciri at Kaer Morhen for some time and is like an older sister to her. It was through her intervention that Ciri was not subjected to harmful hormone changes at Kaer Morhen, stripping her of her secondary gender traits.

Dandelion
Julian Alfred Pankratz, Viscount de Lettenhove, better known as Dandelion (Polish: Jaskier), was a poet, minstrel, bard, and close friend of Geralt of Rivia.
During his travels with Geralt, Dandelion started to write his memoirs, entitled "Half a Century of Poetry"; twice, in fact. His first attempt was lost in the bottom of the duchess of Toussaint's closet after the poet was banished from her duchy. But rather than bemoaning that loss, the poet decided to rewrite his memoirs from scratch. His poems were later bound in two collections: The Adversities of Loving and Time of the Moon.