I don't see the point of playing someone else character in a D&D-type game. Maybe for a one-shot, but not for a full game. Even less when it puts me in the shoes of a companion.
Chances are far higher I make additional playthroughs with a custom party than playing an origin. These origins are far too fleshed out. Its like playing Triss or Zoltan in the Witcher - its neither your story nor do your have the freedom to really make it your own, since your background and big moments are already laid out.
I haven’t played the Witcher games, so forgive me my ignorance, but wouldn’t it also be like playing Geralt, too?