Although not a favorite of creative teacm Joe Simon & Jack Kirby, Bucky was the first superhero sidekick, and paved the way for all who followed. He has had a very colorful, and tortuous storyline, eventually ending up in the. Captain America suit himself. According to Wikipedia:

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"Barnes was born in Shelbyville, Indiana in 1925. He is an orphan, the son of a soldier killed in training at U.S. Army Camp Lehigh. As a result, he is unofficially adopted by the camp as a mascot. Nicknamed "Bucky," he takes to wearing a uniform and becoming savvy with the ins and outs of military life, even though he is a teenager. It was at Lehigh that he meets and befriends Private Steven Rogers, who by all appearances is the clumsiest soldier in the camp. This was at the same time that reports of the then-mysterious Captain America begin to appear in news magazines, and Barnes eagerly devours the accounts of this new hero."