Kage Neko
The leader of the Kingdom

Diamond
The second in command. He is viscious and manipulative and hsa turned many members of the 10 Kingdoms over to the side of the Darkstar Kingdom. Most notably, the two Guardians StarLove and StarFire

Obsidian
Not much is known about Obsidian, except that he appears to be more intelligent than Quartzite, a fact that she resents. I'd say more, but those are spoilers. Serious spoilers for the end of the fic.

Quartzite
No one's really sure what to amke of her. She's always switching sides.

The Triplets
Cheetah, Panther, and Lynx are the Cat triplets. Their main function is that of expendable lackeis. They really don't hve much of a mind of their own.