1

Negative Man
2

Beast Boy and Mento
3

From left to right:  Robotman, Beast Boy, Mento, Elasti-Girl, Negative Man

4

From left to right:  Robotman, Mento, Elasti-Girl, Negative Man
5

From left to right:  Madame Rouge, General Immortus, the Brain, and Monsieur Mallah

6

From left to right:  General Immortus, the Brain, Monsieur Mallah
7

I'm not even going to TRY to explain everyone in this picture.  Many are Toon Titan villains.  The woman in black and green next to Warp is Phobia.