just a bunch of designs for all the Dark Princes and their "names", though being a hive-mind like race they don't need names to communicate between each other in their Hive, but this is what they're known as outside of their Hive by others.

The rats killed off the Cat's hive and "adopted" him of sorts because he could be useful. They call him Omega and make him call them the other names.
Kid is just a little shit who harasses Kaden. He's not a little kid but Kaden's been with him since he was, so thats why he has that nickname.