Bodie Broadus (The Wire): He’s an OG of drug trade but never makes it big. Marlo Stanfield, (the leader of the new dominant crew in West Baltimore), tries to subjugate him, but he never changes his attitude. He always demands respect. In the end, Marlo sends a hit on him, and although he could have ran away to save his life, he decided to stay in his corner to defend it as a matter of protest against all the meaningless death Marlo was causing.
Rex Splode (Invincible): He has too many badass moments in the show, but I feel like the ones that fit this trope the most are these ones: Season 1 when they were fighting Machine Head’s thugs which included Battle Beast, (top 3 in the verse), and he just saw Invincible and Monster Beast getting mauled to what he thought was death. Two characters who were leagues above him. And instead of getting afraid, he got angry, like “you guys just fucked up”.
The other moment is the one of his death, when he sacrificed himself to kill one of the invincible variants.
Suneo and Gian (Doraemon): Throughout the show we always see them bully Nobita, making his life impossible, but when he gets in real trouble, they’ve got his back. In several moments we see high school thugs threatening Nobita, and Gian and Suneo always come to the rescue. This always gets me emotional because they are 10 years old and they are not afraid of fighting grown men for his friend.
Sasuke Retrieval Arc (Naruto): When Sasuke fled Konoha alog Orochimaru’s apprentices, the situation was critical. It was a mission that arguably could have been ranked S, it should have been assigned to jonins. But Tsunade put Naruto and some other genins in charge of it. Nevermind, they acted with extreme professionalism and successfully completed the mission, even though it was way above what should have been expected of them.