Joker
The Joker teeth loops are fraud tech, he takes huge risks for very little little damage, his parry is the worst in the game by far (you risk taking a combo to do 9% damage and be at negative frames, 2% if it's low parry), and he has no good way to spend meter ( you can't really hit confirm into rlg and if the first hit is blocked you can jump it for a full combo).
Killer Frost
big combos off of everything into standing safe 50/50's, very safe in general, I don't think she can really be zoned. Who needs strong normals when your slide goes 3/4ths of the screen and is only negative 4, also you can back yourself up with the best parry in the game.
Ares and Cyborg have that stuff now and this is when the chart was made.