|Occupation||Shūei Clan member|
|Goal||Protect next head of clan, Raku Ichijō|
|Dislikes||Bee Hive Gang|
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Ryuu is shown to be overprotective of Raku Ichijō as he is the son of the head of Shuei-Gumi. He is also quite violent against the clan's enemy and whoever insults his boc-chan. Although, he has also a soft side especially if Raku Ichijō is involved, sometime used as a comic relief.
Ryuu is a tall, muscular man with a large dragon tattoo on his exposed right shoulder. His has sanpaku eyes which there is a scar around his left eye, dark brown hair and mustache. He is shown to wear a light purple kimono with a dark purple belt and has one sleeve from his right shoulder to the side to expose his tattoo and shoulder.
- According to the Japanese Nisekoi Wikipedia page, Ryuu's full name is Ryunosuke Sasaki.