...So perv. Or so it seems. Only two people in the manga world (as far as I know) can be so naturally naive and perverted ( even if in two different ways) in the same time.
One is Senrou Chigusa. His way of acting towards Rakan is sometimes really naive. He tends to find logical reasons to his tendency to hugh and hold the boy. Of course, if you're travelling through a desert that became icy cold in the night, you need a blanket, the warmer the better. More than the better if said blanket can protect you during the night allowing you a safe sleep and sweet dreams.
Chigusa is also a man almost without feelings, and while he ragains his ability to feel he also develops strong protective (and a little perv) feelings for Rakan. But he never lies a finger on the boy without his agreement and the people that keep saying he is a pervert are only envious of his special relatinoship with Rakan. That's the truth!
Chigusa in a typical attitude The Prince without the usual aureola Kinrei
The other one: The Prince (we don't know his name if he ever has one).
You can say, and everybody actually say, that he is a very bad guy with a perverted will to purposely destroy the world in which he himself lives. Surely he's not a cute little good boy. But if you look well you can see that he is basically ensuring his own nourishment source. He doesn't understand men and their society and doesn't want to. He just uses his power and his charme to ensure his livelihood. At the end he's not a man but a being that live of the vital energy drawn by men, plants and other living being. The one who is scheming something less plain, is Kinrei and the real bad ass here it's him.
The Prince shows all of his "naivety" when Kinrei drops the mask and shows to him his power thrist. So the "poor" Prince, that at the end is just an evoluted specimen of ayame demon, found himself caught and in the need to start to think as a human or, you can say, learn to fool others for a different reason than food.
So he shows a good bit of reasoning and problem solving capacity. Startling also his ex-comrade Kinrey that in the meantime discovers that, using The Prince powers for his own goals, was not the only reason for him staying by prince's side.