MCU Bucky: lost, confused, sad soft boi, beloved and woobified by fangirls, who can fight and kill when needed but kind of just wants to live in peace, pretty handy with a gun
Comics Bucky: will offer his teammates and their children guns, will be confused by their refusal to arm themselves with guns, will fucken cold as balls call a fully armed Frank Castle out as a failure without flinching, is an actual Asshole who was 10000% confused he was asked to become Captain America when Steve died but takes on the role anyway, with Added Guns, was literally doing the dirty work for Captain America as a cold blooded killer at the tender age of 16