Couldn't find a DB thumbnail, am on mobile so can't make one right now.
Ciri (The Witcher) vs
Rey (Star Wars)
Overpowered inheritors of the previous protagonist's mantle with deep-lying family issues.
Connections:
Both are adept swordswomen.
Both use a special sword. Rey's self-crafted yellow lightsaber and Ciri's enchanted gnomish gwyhyr Zireael.
Both took on the mantle of the previous series protagonist (Geralt of Rivia and Luke Skywalker).
Both are descended from an evil political leader. Ciri is the daughter of Nilfgaardian emperor Emhyr var Emreis while Rey is the granddaughter of Sheev Palpatine/Darth Sidious.
Both ended up losing one of their father figures during the course of their story (Han Solo and Vessemir).
Both have powerful abilities as a result of their bloodline/training (Elder Blood of Lara Dorren and the Force/Spirits of a 1000 Jedi masters).
Both their love lives were problematic and dysfunctional and the romantic interests (Kylo Ren and Mistle/Skjall) died.
Both were the Chosen Ones of their respective series and fulfilled an ancient prophecy. Rey brought balance to the Force by defeating Darth Sidious once and for all. Ciri used her Elder Blood powers to destroy the White Frost, an interdimensional universe-consuming blizzard that was a threat to all life across the multiverse.