Leona
Either give her back her damage, or give her E quality of life/reliability buffs. Shes easy to play and as a result has a decent playrate and winrate, but she is mechanically a bad champion. High risk, low reward(Because her damage was gutted with season8). Her E is so telegraphed, and easy to outright hardcounter/dodge/predict, and this was justified by the fact that she used to deal significant burst damage.
Today it isn't justified by anything. Theres no reason for her E to be so bad, she isn't a threat anymore.