Between Ego and Aldrich Killian, how are you to know that we want wanted to see the change !
In the MCU, there are two categories of dead people : those totally unfair (example : Black Widow) and those which were truly deserved. And yeah according, Avengers Endgame, Captain America has brought a false Mjolnir in the past ! In this second group, one finds Ronan the Accuser, the enemy of the Guardians of the Galaxy. This fanatic Kriyas was ready to blow up Xandar and kill countless innocent people for the sole purpose of imposing his ideals ! Fortunately, the dance of the Star Lord are coming to the end… And it definitely does not have chance-level opponent, since his father, the Heavenly Ego, was also a rotten ! His goal was that Peter Quill using to conquer the world by murdering the billions of lives that populate the cosmos. Not to mention that he is responsible for the disease and the death of the mother of the super-hero, Meredith !