who is captain america’s sidekick? Hello, welcome to solsarin. The post is about “who is captain america’s sidekick?“. Bucky Barnes James Buchanan “Bucky” Barnes Jr. is a fictional character appearing in American comic books published by Marvel Comics. Originally introduced as a sidekick to Captain America, the character was created by Joe Simon and Jack Kirby and first appeared in Captain America Comics #1 (cover-dated March 1941) (which was …