So Serpentina and the Unnamed One felt that King Hsssssss is not the only one that can lead a faction of Snake men and the Classics canon breaks it down for us as to who is under who's command. Many a times they will consolidate under one banner but a few a are loyal to certain leaders. If you feel this list is inaccurate in any way, please feel free to express that notion.
Serpentina -Goddess to the evil Snake men, Supreme Leader to them all.
Unnamed One-Servant of Serpentina, created the Snakemen for her.
King Hssss
King Hssss – Dreadful Disguised Leader of the Snake Men
Real Name: Hssss of the Viper House
A servant of the Unnamed One, Hssss was chosen to lead an army of Snake Men to the planet of Eternia to plunder its magical secrets. He ruled Eternia for three centuries until a rebellion formed under D’vann Grayskull. Soon afterwards, the Horde invaded and Hssss was drawn into a three-way war. All three sides agreed to a temporary truce in order to construct the Three Towers, but Hssss was betrayed by Hordak and in time was banished to the Void by the Elders and Zodak. For five thousand years he and his army waited until Evil-Lyn and a Snake Men descendant named Kobra Kahn opened the Snake Pit to free them. King Hssss often tricks foes by appearing heroic but then transforms into a seething mass of serpents and leads the Snake Men into battle!
Rattlor
Tung Lashor
Snake Face
Squeeze
High Priest Pyhonus
Kobra Khan(when convenient)
Ssnake Man at Arms
Snakemen
Lady Slither
Revenge Squad- all not snake men
Major Header
Muckman
Bubblor
Tri Beast
Rajar
Gangstor (although disquailfied)
Diabolical Snakes
Camo Khan, then Reptilax
Fangor
Terr-roar
Lord Gr'asp
Snake Troopers
Golden Rod
Vypor
Annacondus
Quick Flick