Shu has been described to be lazy to the point of simply being lethargic.

Not much affects him, not after what happened in his childhood, and he rarely takes part in anything if it doesn't interest him in the slightest. The only time he ever bothers doing anything is if his younger brother, Reiji, provokes him; though, this has more to do with the bad blood between the brothers as neither of them like each other very much.

Since this is the anime version, not the game version, Shu has been portrayed slightly differently.

He has proven himself to be perceptive, easily recognizing Richter's presence around their home and figuring out what his uncle's plans are. Shu also has proven to be knowledgeable on the history of their kind that dates back to the Founders, along with the effects of certain lunar eclipses that affects both the mortal and demon worlds. It has also shown that the only time he ever bothers to get up from his sleeping position is when the situation is serious enough that calls for it.

Otherwise, Shu has shown to have a caring, even perverted, side to his personality.

The caring side is shown rarely, though he often does warn Yui - the heroine - not to get close to him. This call is affected mostly because of what happened to his childhood friend, Edgar, and he believes that anyone who gets close to him will end up dying like his childhood friend did. He is completely unaware that Reiji had been the one to kill Edgar.

His perverted side rarely comes out as well, however, but when it does, he's mostly prone to teasing, often making subtle dirty comments to make someone flustered.

This will be a work in progress.