He has short blond hair with an ahoge, representing Nantucket, sticking up and blue eyes. His glasses are said to represent the state of Texas.
America is a cheerful, energetic yet somewhat conceited young man who is obsessed with heroes, justice, and freedom. He has the habit of sticking his nose into everyone else's business, which causes him to have difficulty making friends. He loves hamburgers and junk food, and can even eat strange and inedible things due to inheriting England's sense of taste (or lack thereof). America is also known for not being aware of how "the atmosphere" is when he's around others (which, at one point, he was told to read it), but it has been noted that it is not that he lacks the ability to "assess the situation", he simply chooses not to. His profile states that his hobbies are sports, games, and making movies. He possesses an abnormal amount of strength, shown even as a child by easily swinging a full-grown buffalo around, and has been once seen running around dragging a heavy SUV, belonging to England, behind him for an hour in order to ask permission to borrow it.
America is shown to be ignorant of the geography outside his own home, believing that maps of the United States are a "world map" and believes that he can simply get to other countries by car travel. He is shown becoming concerned about his weight in the strip 'Supersize You!' and it is mentioned that he's invented strange diet machines as well as becoming obsessed with exercise (which has caused him to become paranoid about his rising weight, as he is unaware of his building muscle). Aside from being afraid of ghosts and weighing scales, he also fears marmite. As America is obsessed with heroes and happy endings, he hopes that his future will be that way.
Though he is friends with an alien named Tony, he doesn't believe in England's magical friends, the fairies or unicorns.