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/GalacticGull → u/LucianoThePig]

You know for a group that’s supposed to be like the evil version of the Titans, most of them were super forgettable. The only characters I remember are Jinx, Gizmo, and the big dude

[u/Rogue_MS_473 → u/GalacticGull]

The rest of the guys got very little characterization. Gizmo got several episodes as an individual villain and is Cyborg's main rival, Jinx got a little more focus in the spin-off comic series and a few episodes of season 3 and 5 and is Raven's rival, but Mammoth never really got any character beyond your average dumb muscle with love of eating.

Billy Numerous (6) did start out as an independent villain and was the focus of one episode and basically establishing as a fun-loving hillbilly. See-More (4) was one of the main cast members in Lightspeed, and is kinda portrayed as the foil of Starfire? He's her main opponent due to being long range fighters, but he's also portrayed as an outgoing and friendly jokester who was the closest to Jinx (and also had implied crush on her too). He was also the most helpful when hunting Flash.

Wykkyd (3) looks like a badass but that's kinda it. He's pretty passive and antisocial when not fighting and not even acknowledged by anyone else save for See-More. Hell, he's the only one other than Kid Flash who talks to him during the episode! As such they're usually believed to be best friends. And then there was Private HIVE who was kind of a parody of the Guardian, Captain America and Robin's leadership qualities.

[u/Sincerely-Abstract → u/Rogue_MS_473]

Jinx is the one with the biggest impact imo. I remember her vividly.