Edd, mostly referred to by his nickname "Double D," (Samuel Vincent) is one of the three protagonists in Ed, Edd n Eddy. He is physically the weakest but the most intelligent member of the Eds.
Edd wears a red T-shirt (orange on occasion for websites, games, artwork, Season 5 and the movie), purple shorts, long red thigh-high socks, cyan-colored shoes with yellow soles, and a black ski hat with two white stripes on each side. At nighttime, Edd wears a yellow onesie and his ever-present hat.
Edd has three black hairs that stick out of his hat in a similar style to Eddy's, but facing downwards instead of upwards. His two most notable physical features are his big chin (said to be similar to Kevin's), and the gap between his teeth.
In the first season, his skin was light yellow, but it progressively became more desert sand-beige. His eye color was shown to be blue-green on the front cover of Ed, Edd n Eddy - The Mis-Edventures. His tongue is a mint-green color. Two frames in "Fool on the Ed" reveals Edd's eye color to be a light green in the first instance and a very light gold color in the second instance.
In the later seasons, Edd wears a yellow tie over his shirt when attending school. When going outside, he wears a brown cardigan with olive drab trimmings. When it is snowing, he wears an orange snow jacket, light green scarf, earmuffs, and purple snow pants with a white stripe on both sides.
Edd is a rather scrupulous, but kind and good-intentioned youth. Docile, polite and disciplined, he willingly adheres to the laws and regulations of his community. With his love and desire for order, he occasionally undertakes the role of a peacemaker. He is incredibly gentle and accepting, albeit sometimes awkward and timid in his interactions, particularly with people of the opposite sex. Although considered an outcast, he is a generally well-respected, if not appreciated, member of his peer group, whom he gladly counsels and assists if need be. It is often suggested through his interactions with the other children in the Cul-De-Sac that if it were not for Ed and Eddy, Edd would be welcomed among their group. Even so, perfectionist Edd is something of a "goody-two-shoes," wishing to please and accommodate to the needs of others.
Edd is quite delicate and mysophobic, disliking any potentially "harmful" form of physical activity and among all, contamination. He will go great lengths to cleanse his environment, and exhibits numerous idiosyncrasies; among these odd habits are his tendency to name tag his every possession, to the extent of claiming to "not be able to rest in an unlabeled setting." He has a significant dislike of sports as well, rooted perhaps from an infamous, scarcely mentioned dodgeball incident from his childhood.
What Edd lacks in physical strength is substituted by his intelligence, in a total reversal of the dim-witted yet physically stronger Ed. Exceptionally precocious, Edd is a promising young inventor with an interest in science. Although clever and perceptive, his foresight is often denied by an insidious Eddy. It is then that he displays his characteristic neuroticism and sarcasm, to the chagrin of his friends. Edd has also proven on many occasions to be quite brave. In "The Day the Ed Stood Still," he volunteered to potentially sacrifice himself to make up for his creation of Monster Ed. In the movie, he is among the first to stand up to Eddy's Brother while he was torturing Eddy.
In earlier episodes, he was a little more laid back and a lot more soft-spoken, he was also much more subservient to the whims of Eddy. However, as time wore on and his character expanded, he not only became more understanding and disciplined but also more sarcastic and insubordinate to Eddy. He also began to talk a lot more than he used to. His quirks were also played up a lot more as well, such as his intelligence, his perfectionism, and his obsessions with order and cleanliness.
He also gets upset when people are better than him in something he excels at, as seen in "Ed in a Halfshell," "Too Smart for His Own Ed," and "In Like Ed", suggesting he has somewhat of a superiority complex.