The Darthvegans. Possibly the most hostile race in this local cluster of planets, passing even the bellicose Suburbionites or constantly warring Boggobians in sheer hostility (At least the Boggobians are friendly enough to other races!). We know little about them, but they likely know more than enough about everyone else, which is a chilling thought. It is likely they are only in an armistice with the other races due to the collective treaty among us all.
What little we do know of this devilish race is that they have conquered planets in the past, which were never heard from again. Due to Darthvega's nature as a space station rather than a typical planet, it is capable of approaching other planets to engage in combat. It is highly likely they are far more well-armed than the outside appearance would suggest.
No Darthvegan has ever left the ship for any other purpose than combat on record. It is unknown as to what they eat, what they do for leisure, if at all, or if they even have names. When left to the imagination, society within that big polyhedron probably amounts to something far stricter than Suburbion law enforcement or Grannest transport procedures. The fact of the matter is, no one knows. As of writing, anyways