Almost Successful Villains

Villains who nearly complete his goals or had a partially victory. Examples

Lord of Darkness destroying Blue's trust on Princess Celestia, Princess Luna, Twilight Sparkle, Ponyville and possibly all Equestria

Malefor killed Zordon and destroyed 70% of Disney

Nerissa killed all Will's friends with the help of Darkseid and Rugal Bernstein, destroying her spirit

The Biskit Twins destroying Blythe's reputation as heroine

The Joker nearly destroyed with his parastic virus and managed to kill a lot anyway.

Hunson nearly took the multiverse for real and defeated all of the heroes

Darkseid nearly got his hands on The Anti-Life Equation and lived

BlackGarurumon killed the DigiDestined apart of Tai and Sora

Pandora attempt to open her box to take over multi-universe.

Izaya were about to kill Tuxedo and his allies but failed to do so.