There are no aliens in New Eden except for the slaver hounds that the Amarr Empire uses to hunt down escaped Minmatar slaves and those ugly creepy-crawly little critters that the Minmatar use on their ships to clean the wastes they leave behind.

The Jovian Directorate (the fifth empire of New Eden) may seem alien to some, but they are technically humans who decided to mess around with their DNA to better survive the space environment but then ended up suffering a genetic disorder that causes them to be severely depressed and commit suicide. They are the only empire of New Eden that cannot be accessed by players and are only accessed by CCP employees for testing purposes.

Beyond that, there are Rogue Drones. But even then they are not alien as they are based on human technology gone awry.

What is this? A safari hunt in Africa?

I'm talking about highly-evolved aliens who are about the same level as humans (ie: those long-head blind creatures from aliens, blue tribal cats, heat-seeking predators, etc.). I'm not talking about some woodland critters or some nasty mass of biological ugliness that the Minmatar use to clean their ships.