It's going to be very difficult to make created character both voiced and enough "my own" for me to feel like I'm actually role playing as well... myself. That was my tiny issue with Wittcher 3. I love Geralt dont get me wrong, but you just could never feel like it's actually "you" in this world, instead it was more of a "you as a Geralt", which isn't a bad thing, it's just a thing, thing that I dont really want in Cyberpunk 2077.
To make character both voiced and "your own" CDPR will have to build entire game and its plot around it. Mass Effect tried to do this but it all came down to being either a nice guy or an asshole, I havent played VMB yet and I'm currently still getting throu oryginal Deus Ex (and having absolute blast btw.), but the game that I actually know that did it right was Gothic series. That being said Ghotic's plot wasnt anything outstanding and strong plot is a thing that we all expect from CDPR.
Looking at all of this it simply seems impossible to make those 3 things (voiced protagonist, fully immersive role playing and strong plot) fuse all together. On the other hand that's what I thought after I heard that CDPR want to carry over Witcher 2 complex story telling and world changing consequences into the biggest open world in RPG genre, and they actually did pull it off, even if with some concessions.