Heroes That Turned into Villains | The Dark Side 

Red hood and Catwoman should have their very own spin off television series starring Jensen Ackles and Adrienne Barbeau

After Jason Todd as Robin being killed by The Joker and that Jason becomes Red Hood doing things that Batman wouldnt do, By time goes he is becoming a anti hero being accept again as a member of the batfamily (having funny interaction between Jason and Dick Grayson) and having his own team like the Outlaws with Bizarro Superman and Artemis

I think you forgot about the Scarlet Witch after she was corrupted by The Dark Hold.. but I wouldn't doubt there's quite a bit more 😂

Imagine if Wonder Woman or Batgirl turned to villains

Two Face has reformed several times

Anakin reformed but it was many years before he did

I hear that Supergirl, Mary Marvel and Nick Fury turned good again

As far as I know, Jason Todd reformed

I didn’t know that Nick Fury, Supergirl, Mary Marvel Green Lantern turned bad. Did they ever turn good again?

I think Saruman the White from The Lord of the Rings counts