When he had his body, Hector was a very tall and muscular man with large arms, a large chest, but thin legs. He had long silky black hair along with body hair on his chest and forearms. Before his body was destroyed, he was seen wearing a white shirt with purple pants and brown boots along with a gold necklace around his neck with a purple gem. Around his waist he wore a black belt with a purple buckle which displayed his signature "Hector Con Carne" logo. His face was never fully seen but he had a rather large dimpled chin and women found him to be extremely attractive. His original body appears in "Bring Me the Face of Hector Con Carne", and "The Mother of all Evils".
He is a pink brain with black eyes and a darker pink stem that serves as a "hand". He is inside of a green glass dome filled up with water that is attached to Boskov the bear along with Stomach. In the pilot episode, Hector's brain had a much rounder shape, but in the first season, he's given a brain-like shape, and then in the second season, he's given much more detailed features, such as being made bumpier and more fleshy-looking, and was given a purple temporal lobe.