Charles Percy

Charles Percy is a Surgical Resident at Seattle Grace Mercy West Hospital and previously at Mercy West Medical Center. He is a good doctor and is good friends with Reed Adamson. 

Reed Adamson
Charles is good friends with Reed, who nicknamed him Charlie. He has a crush on Reed and is very protective of her, especially when it comes to Alex Karev and selling sex.

Izzie Stevens
Charles was assigned to Izzie in Invasion, pretending to be nice to her but in the end, Izzie was his surgical bitch.

Career
Dr. Charles Percy was a third year resident at Mercy West but he soon started work at Seattle Grace following the merger. To get ahead he pretended to become Izzie Stevens' friend (nicknaming her his surgical bitch) and user her knowledge for information such as the research library's code. He later claimed that at Mercy West people could be friends outside the hospital but not in it (although he had earlier offered to two of his fellow residents to give them information).