Now that it appears that Affleck will have his own solo Batman film franchise in the title role of Bruce Wayne/Batman then it begs the question of which villains we need to see so that being said the villains I would go with:
Deadshot
The Joker & Harley Quinn
Hush
The Red Hood
Riddler
Two-Face
Black Mask
Deathstroke
Penguin
If Affleck gets a trilogy of films then the 3 out of this list I would nominate would be:
Movie 1- The Joker & Harley Quinn (villains)
Movie 2- (sequel)- Deathstroke (main villain); Two-Face (secondary antagonist)
Movie 3- (threequel)- Hush (main villain); Riddler (secondary antagonist)
Deadshot
The Joker & Harley Quinn
Hush
The Red Hood
Riddler
Two-Face
Black Mask
Deathstroke
Penguin
If Affleck gets a trilogy of films then the 3 out of this list I would nominate would be:
Movie 1- The Joker & Harley Quinn (villains)
Movie 2- (sequel)- Deathstroke (main villain); Two-Face (secondary antagonist)
Movie 3- (threequel)- Hush (main villain); Riddler (secondary antagonist)