Out of the way Geralt, Ciri should lead The Witcher 4

This article contains spoilers for the entirety of The Witcher 3. 

One of The Witcher 3’s many endings sees Geralt’s adopted daughter, Ciri, set off into the wilds and become a famous Witcher herself. It is the one thing she always wanted: to be free. Born into royalty, Ciri has no desire to sit on the throne after her blood father, Emperor Emhyr var Emreis, passes - she wants to follow in the footsteps of her monster-murdering surrogate dad, the silver-haired Butcher of Blaviken. Her spirited nature makes her the perfect candidate to be The Witcher 4’s hero.

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The Witcher books are thematically about fate. In them, fate is seen as a double-edged sword, with Geralt and Ciri representing the two sides of that sword. Geralt does not believe in destiny, but Ciri is constantly battling against it as she is dragged along by its current. Knowing your life was already planned out, would you not also seek freedom? 

from
https://www.pcgamesn.com/the-witcher-3-wild-hunt/witcher-4-ciri-main-character