Shintaro is a handsome man. He has pitch black, spiky hair, tan skin, and cold, gray eyes.
Shintaro is rather strict and tempermental towards Ichigo, but only because he wants to protect her. Shintaro is actually very caring despite his outward appearance.

Shintaro hates Masaya Aoyama, Ichigo's boyfriend, while Sakura Momomiya, Ichigo's mother, is fine with their relationship.
(Source: Tokyo Mew Mew Power Wikia)