Natsuhiko is a seemingly shallow individual, although he is not unfriendly. His motives are rather dubious, and it appears that he works with Tsukasa and Sakura simply because he has a crush on Sakura. He was willing to trick Nene and put her in potential danger but doesn't seem to have any ill will towards her.

He seems to have a flirty side, and is rather reckless and perhaps not too bright, as seen during his attempt to escape with Nene back to the regular world. Despite having been partially responsible for bringing Nene into the situation, he also tried to help her escape and opened each door so that she wouldn't put herself in danger. When he was unable to continue himself, he encouraged her to continue.

He is loyal, or perhaps obsessive, to a fault, since he continues to have a crush on and pursue Sakura ⁠— despite her outwardly cold demeanor — and becomes excited by her minimal attention, even if it's negative. Natsuhiko holds no grudges when treated poorly and is willing to get into trouble to save his friends. This can be seen when he risked a confrontation with Teru to get Mitsuba out of danger.