8. T'Challa Spares Zemo's Life - Captain America: Civil War
In Civil War, Black Panther came to Vienna with no intentions of fighting, going to war, or even suiting up, let alone trading blows with Earth's Mightiest Heroes. He was forced into this position however, when his father was killed at the ratification of the Sokovia Accords.
As Bucky was framed for the explosion that killed the King of Wakanda, T'Challa swore revenge, almost automatically earning himself a place on Team Iron Man. He didn't care about the politics between Tony and Steve. He was there simply to kill the Winter Soldier.
After the truth was revealed however, that Bucky had been framed as part of a wider plan, Black Panther's hatred and anger could have, and probably should have, turned to Zemo.
Instead, T'Challa chose not to kill the man responsible for his father's death, even going so far as to stop the villain from killing himself. He acted as a true hero, and a man as wise as his father before him, refusing to let himself become consumed with vengeance in the same way that Zemo had been.