Raven - One dash and you cannot try anything or else if you hit them whilst they are doing df2, you'll get knocked down furthering her getting in.
Killer Frost - Very fast projectiles and an iceberg that is opponent location-specific. I laugh at Deathstrokes who try to zone me when I pick her.
Aquaman - Ass spikes and an okay forward projectile. One ground spike and you have something to work with, imo.