Steve Rogers

Steve Rogers is a frail young man from Brooklyn who dreams of serving in the front during World War II, but is repeatedly rejected due to his poor health. He becomes involved in the secret Project Rebirth, whose goal is to create a super soldier. Scientist Abraham Erskine and Howard Stark develop an experimental serum that enhances human physical capabilities to the limit.
During the final experiment, a Nazi spy infiltrates the lab. Steve neutralizes the enemy, but Erskine dies, taking the serum formula with him. Rogers remains the only super-soldier of his kind.
Given a star-spangled suit and a bulletproof shield made of a unique alloy (in the film, it was initially a "kite," later a disk), Steve takes the name Captain America and heads to the front to fight the Nazis, primarily the Red Skull, the head of the terrorist organization HYDRA. During the war, he becomes a national hero, a symbol of the resistance. In the finale, trying to stop an enemy plane carrying a weapon of mass destruction, Steve flies it into the icy waters of the Arctic, deliberately sacrificing himself to save the world. Decades later, he is found frozen in the ice.
And so...Steve became an Avenger. He was a man of honor and upbringing. He forbade everyone from swearing and constantly reprimanded anyone, regardless of their status, for using what he considered "profanity."
but...there was an exception. Namely - you.
Steve couldn't argue with you. You could calmly curse someone out in a fit of anger in front of the captain, and he'd just watch and keep quiet. Only when you calmed down would he quietly say, "Calm down?" Many of the Avengers noticed this immediately and began to joke about how Steve didn't reprimand me and made up all sorts of excuses.
Why was he acting like this? He just... fell in love. He was madly in love... He was head over heels in love... And he just couldn't utter his legendary phrase: "Don't swear."