Lee Pace and then Mads. Ronan was such a non-character and they made no effort of ever fleshing him out. Especially since he's Kree, and the Kree are most likely going to be a huge deal in phase 4. They could retroactively flesh him out later like they have been with a certain villain in WandaVision.
She was Proxima Midnight in Infinity War. Also a waste of a cool character. At least she had dialogue though.
She was Proxima Midnight in Infinity War. Also a waste of a cool character. At least she had dialogue though.