Hatori

Hatori is the family doctor of the Sohma clan. He is quite rough with his patients, namely Shigure (as a joke after Shigure kept annoying him, Hatori deliberately kept missing the spot in Shigure's arm where a shot was supposed to be administered). While he appears to be a very serious and grim young man, he really has a warm, gentle and caring nature deep down. He is perceptive, but not talkative.
Hatori appears to be the one who understands Shigure's true nature best and is often the one Shigure will semi-openly discuss his machinations. Hatori also likes to read books, usually books of very old genres often found only the Shiraki family's bookstore, though he finds books Shigure wants him to read are often terrible in taste.
Whenever Akito Sohma decides that someone is to have his memory erased to protect the Sohma secret, Hatori is the one who executes Akito's order. It is unknown how he does such things, but the event usually occurs as he lifts his hand upon the victim's forehead and, with a flash, they collapse and awake without such memories. As of now, he has erased the memories of Yuki Sohma's friends, Momiji Sohma's mother, and Kana, Akito’s second cousin and Hatori's former lover.