#2. Charlotte Flair - Off WWE TV from June to December 2020

Charlotte Flair was written off WWE TV with an injury, and while she was expected to be off for longer than usual, nobody realized that she would be away for almost half of 2020.
It was a mix of requiring surgery as well as the pursuit of projects outside of WWE that kept her off TV for almost half of 2020. When Charlotte Flair returned, she teamed up with old rival Asuka to win the Women's Tag Team Championship - making her a WWE Grand Slam Champion.
#1. Brock Lesnar - April 2020 to present

Brock Lesnar has been away from WWE TV for almost ten months now, considering that the last time he wrestled was at the end of March for the pre-taped WrestleMania 36.
He lost the WWE Championship to Drew McIntyre, and while he normally returns for SummerSlam season, that wasn't the case in 2020. WWE kept him off TV after WrestleMania 36, not knowing when crowds will return. It appears as though WWE didn't want to utilize Brock Lesnar while holding empty arena shows.
According to various rumors, Brock Lesnar isn't even under WWE contract anymore, but he is expected to re-sign when he is approached again.
Big name returning at Evolution? More details HERE