Red Hood, Barry Aloysious Dylan, and Captain Cold.
My MU spread isn't bad, and I really enjoy playing as each of them despite hating them as characters.
Red Hood has beautiful staggers, capable anti-/zoning, and setups. Good MU chart for added bonus.
Flash has crazy damage, good pressure, and setups for days. MU chart isn't as pretty as Red Hood, but having him there feels good.
Captain Cold has even moar damage, completely shuts some characters down, and has good setups. MU chart is weird, but you should only be playing him to counterpick.