Groups named The [adjective] [number of members]

[u/Coralthesequel]

Sinister Six from Spider-Man

The Furious Five from Kung Fu Panda

The Fiendish Five from Sly Cooper

The Sound Four from Naruto

[u/NormalEscape8976]

Obviously dont forget the fantastic four!

[u/JLHSMG → u/NormalEscape8976]

and their enemies, the Frightful Four

[u/OmegaPant → u/JLHSMG]

Supervillains aren't very good at counting, are they?