Maybe it's because we got to see his pov and because he actually changed with "the power of love". Like, most of these badass edgelord tsundere princes/kings/whatever say shit like "uwu you changed me" but still have abusive behaviors to other people apart from the mc, however this guy has actually gotten better, more considerate of his friends, and even capable of recognizing his mistakes from the game's other routes. He actually has developed as a character from when they were kids, what should be obvious, of course, but in stories like these it's somehow rare.
Yeah it is. The MC is not a typical dark or bright energic dramatic muscular shounen hero. And so far I haven't seen any sexualized female characters in there.
You should try "Skeleton Soldier Couldn't Protect the Dungeon" because the MC is very very unusual and the female characters are quite strong and not overly sexualized. They wear a lots of pants ^^

I think that MC/ML is probably the first scheming op blonde prince that I ve ever liked and find it very endearing.
Normally I would hate MLs like him but there is sth about him that makes him very redeemable.
Even though he displays some traits like the asshole crown princes/MLs from other isekai novels, what makes him so different than the others who uses their superiority to bully and saving the FL?
You probably read already other Isekai Stories about Villainess, Maids or Extras where the FL/MC is always usually patronized/bothered/mistreated by a cruel cold bored immature arrogant tsundere prince.