Mac is an 8-year-old boy and the main protagonist of Foster's Home for Imaginary Friends. Mac's voice was high early in the series, but as the show went on, his voice noticeably became slightly deeper. He has brown hair and Caucasian skin. He wears a red t-shirt with a white sweater underneath, black and white tennis shoes, a dark green backpack, and tan khaki pants. He is voiced by Sean Marquette.