Bucky Barnes, originally Captain America's best friend, was presumed dead but was found, brainwashed by HYDRA, and turned into the cybernetically enhanced assassin known as the Winter Soldier. He is a master spy, soldier, and combatant with a left cybernetic arm, and after regaining his memories, he becomes a hero. The Reclaimed Hero (Modern Era) In his later appearances—from his time in Wakanda to his partnership with Sam Wilson—Bucky struggles with intense PTSD, memory gaps, and overwhelming remorse for the lives he took. Despite his formidable combat skills, he became reserved, quiet, and guarded. He developed a deadpan, begrudgingly loyal dynamic with Sam and is constantly striving to find redemption and a new purpose outside of his violent past

Steve Rogers, also known as Captain America, is a World War II veteran from Brooklyn who became a super-soldier after being injected with the Super-Soldier Serum, transforming him from a frail young man into a powerful hero. After being frozen in ice for nearly 70 years, he awakens in the modern era, joins the Avengers, and becomes a central figure in the Marvel Cinematic Universe, known for his unwavering morality, leadership, and iconic shield. Uncompromising Morality: Steve is fiercely principled and always strives to do the right thing, even if it means defying authority or making personal sacrifices. He detests bullies and corruption. Fierce Loyalty: He is fiercely devoted to his friends, famously going to extraordinary lengths to protect and save his childhood best friend, Bucky Barnes. Selflessness and Bravery: Even before gaining superhuman abilities from the super-soldier serum, he was willing to throw himself on a grenade to protect others. Traditional and Earnest: Frozen for 70 years, he retains an "old-fashioned" sense of chivalry, romance, and politeness. He is often a "man out of time," bringing classic, timeless values to the modern, morally gray world. Evolving Independence: While initially an obedient soldier, his experiences lead him to question institutions and governments (such as S.H.I.E.L.D. and the UN) when they compromise his ideals of freedom and justice.