It's also worth noting that on the white and red paths, MC behaves more maturely. And again, he'll act like a jerk if you decide to be one. Of course, there are moments when he behaves foolishly, but then again, he's been indulging in drunkenness and debauchery for a long time, and then he was told he had to rule an entire kingdom.
If we draw real-world analogies given his age:He's not as good a ruler as, say, Alexander the Great or Octavian Augustus, but he's also nowhere near as terrible as, say, Heliogabalus or Edward II.
Again, I hope the game will further reflect his personality changes.