
Basically he's got heavy sociopathic tendencies ngl I think he definitely is a sociopath
He doesn't even feel that much attachement to his own mother, all he wants is three things: Become a historically famous emperor, accomplish his expansionist goals (he wants to take over neighboring nations/ invade them) and have Luce.
He takes a crazy amount of time to understand that he loves him cause he doesn't know what the emotion of love is, he realizes it incredibly late in the story.
He deeply cares about politics and decorum, he's very arrogant and wants people to see him in a positive light, only Luce really sees his other sides, he's definitely most comfortable around Luce and he's most likely the only person he trusts after himself.
He's extremely violent and calculating, he's willing to destroy entire nations just for glory cause tbh his nation is already very powerful he doesn't need to take over other people's land, he wants to do it to be remembered as an exceptional emperor and to do that he needs to use Luce's hometown, Vera, which I believe is neutral ground.
Anyway, it's dramatic story, very entertaining, quite dark.
It does take him a long time to realize that his emotions are love and love means not hurting that person even if they don't give you what you want.
His priority has always been being a glorious emperor regardless of anything else, hence why he uses Luce. But then, that shifts, he throws it all out of the window because Luce becomes even.more important than that. Which is huge cause he makes his whole life about being emperor. Lunacy really fits the name cause so far it's just starting, he gets worse with Luce but it all gets crazier once his lunacy becomes less of a secret to the court. He won't even care later on, he'll just obsessively chase after Luce.
Though I gotta say both him and Luce are crazy. Luce definitely loves him, even knowing he's a lunatic, but the prince fumbles the bag many times cause all he had to do was ask and Luce would stay. Instead he hurts Luce and his pride making Luce not want to be with him. Again, the prince is a noble prick who does it all through violence plus he's really young so it all takes a while. But the ride is very interesting.