There are 23 One:12 Collective characters on this checklist, across 39 figures.
The most featured are
Batman (14 figures), Daredevil (2 figures) and Joker (2 figures).
Batman
Black Mask
Cable
Catwoman
Commissioner Gordon
Cyclops
Daredevil
Deadpool
Doctor Strange
Frankenstein
Harley Quinn
Iron Man
Joker
Judge Dredd
Moon Knight
Popeye
Punisher
Red Skull
Spider-Man
Spock
The Joker
Wolverine
Wonder Woman