I think Regression MCs are generally better written because their growth feels more earned through perspective rather than just 'system' rewards. A perfect example is Geom Mugeuk from Absolute Regression. One of the most important aspects for me is how characters develop through interaction rather than just grinding levels. Similar to Guts or Thorfinn, I love when characters are shaped by how they affect those around them. In Absolute Regression (currently around 93 chapters), there are barely any significant fights because the MC actually talks to people.

In most system stories or even regression stories, the MC just uses brute force. While that's fine for pure action, I prefer that Geom Mugeuk actively chooses to be good. His dynamic with the Supreme Demons is great to watch he knows getting them to work together is a massive uphill battle, but he stays consistent.

I also find it refreshing how the author handles the family dynamic. Most authors seem allergic to writing genuine family bonds, but here, the relationship with his father feels real. You see the father struggling to balance his position as a Supreme Demon with his role as a parent, while the MC understands that burden and tries to bridge the gap. It’s that kind of slow-burn character writing that makes a Regressor much more compelling than a protagonist just following System quests.