Rench

From Brikipedia:
"His head is much like Kranxx's, having the same shape, but colored green. His LEGO.com bio says that he is the third "nega-cousin" of Kranxx, explaining the similarities. His crimes are planetoid smashing, crunching prison pod walls, and bashing ultra-steel barriers. Rench is not very bright, but he loves to break things. He is the hired muscle of the Black Hole Gang."

Kranxx

From Brikipedia:

"Kranxx is an alien criminal and is the leader of the Black Hole Gang. He has a skull belt buckle and skulls on his vest, which is the symbol of the Black Hole Gang. Kranxx is usually found breaking speed limits or blowing up diners. Kranxx is a pilot with a will for speed. He pilots smaller craft with large thrusters."

It should be noted that Kranxx has a cousin Rench who is Lime Green.

Space Police

They formed shortly after the Blacktron for obvious reasons. They have gone through several updates over the years.

Blacktron

The worst villains in the galaxy. Blacktron are to be avoided at all cost, unless you are:

1. A fellow Blacktron

2. Feeling the need to be disintegrated

They can be recognized by a Black, Yellow, Trans Yellow, and Trans Red color scheme or the newer Black and Trans Neon Green color scheme.

Fleebnorks

Fleebnorks are very hungry, power leaching creatures. They bring great strife to ship captains who half to deal with them. To quote Fleebnork.com the leading source in Fleebnork knowledge: 

 "So just exactly what is a "fleebnork?!" Well, they're nasty little critters that like to chew on the power couplings. They also aren't afraid to attack when provoked. They seem to be able to consume and chew through almost anything. Efforts by the Lego Space Force to exterminate the pests have been met with limited success. The most effective solution at this time is simply to burn them off with plasma flamethrowers."

Given the Fleebnorks breed faster and more often than most animals, it has caused Plasma Flamethrowers to become the third most common product circulating through the galaxy, beat only by post-hyperspace jump nausea relief pills and Mr.Puffs puffy stuff snack food.

Squidmen

Squidmen are currently some of the most endangered species in the galaxy.

After the lost of there home planet anthropolios, only the minority of space fairing Squidmen where left. Most are either Grey or Lime Green.