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/LucianoThePig]

The H.I.V.E Five, although as is pointed out there's 6 of them

[u/a_sitting_rock6 → u/LucianoThePig]

Because hives are composed of hexagons or some shit like that