Warning: Spoilers for all seven volumes of the manga follow!

On the surface, Seeu is a cold, unfeeling doll of a person who gives little regard to the opinions and thoughts of others and does pretty much whatever the hell he wants. Basically, when he wants to do something, he does it, without asking or telling. It almost seems as if he does everything on a whim. He takes Kaguya from her home in the beginning of the story. He pries her away from Bambi later on, in volume four. He keeps her in his castle for a long time, only showing himself before her when he feels like it. He agrees to most of her demands, but even that seems like just another whim, and he clearly refuses one of her demands before she can even make it (to go for a walk outside with her).

But there is more to him. There is a child-like insecurity, a great deal of loneliness, and that touch of madness that earned him his nickname. He obviously longs to reach out to someone else, to touch another human. This is quite blatantly revealed in his dreams and in the scene where he almost touches Kaguya’s head. He wants to touch and be touched. But after hundreds of years of isolation, it’s incredibly difficult to allow himself that luxury.

Seeu is prone to violent rages, to the point that Meshie seemed to fear for Kaguya’s safety while she was in the palace. He was seen at different points in the series destroying dolls (the ones who tended to him as a child, and then the Kagami dolls). He also sliced someone’s arm off just for grabbing him. These rages can probably be linked to the fact that he spends most of his time behaving as a completely emotionless doll. He can’t express happiness, affection, or sadness. His emotions get bottled up so tightly inside him that they eventually explode.

Seeu eventually proved that he was capable of changing, of becoming a different person. Kaguya touched him, and he slowly became accustomed to her. Perhaps it was her gentle, disarming nature that got through to him. This set off a chain of major changes for Seeu. Toward the end of the story particularly, Seeu seemed much more open and expressive. He made some important decisions and his earlier tendency to “shut off” when faced with something deeply emotional seemed to have disappeared. Hundreds of years of loneliness came to an end, and the story ended well for Seeu. He and Kaguya were living happily together, with a child of their own. Finally, the Asu bloodline could continue.