That’s a really tough question that can change based on the writer or my own whims!
Right now I would have to say Mirage: There’s something I love about a character who starts out as an insecure outcast that’s angsty, distrusting, and even resentful to those around her, only to grow into a strong and compassionate leader who’s always looking out for her team.
I could see Ciri as the protagonist, it also wouldn’t surprise me if they take a note from Cyberpunk 2077 and allow players to create their own character.