No respected chaos leader would be without a dozen inept henchmen by their side. And GW released a conversion pack for just that purpose.

The chaos henchman conversion pack
Chaos cultists, using bits from the conversion pack
These are soft plastic minis from the 54mm collectible miniatures game Mutant Chronicles (left and right). The middle figure is called morbid beast ‘chimney’ by Kromlech
Another chaos henchman

And here is a chaos leader to boss them around

The Chaos Magus (an official release from the inquisitor range)