Anzati
Remember this guy? You probably don't, seeing as he was really only visible in the initial pan of the Cantina in A New Hope, but maybe you recognized the hookah. Hookah Man here is, according to the EU, not a mere human, but an Anzati named Dannik Jerriko. But what is an Anzati?
The Anzati, and their fundamental problem, can be summed up shortly. They are space vampires. Fooking space vampires, to wax a la District 9.
Of course, rather than feed on blood, they variously feed on brains, luck, or the "Force within each person". The original pair of short stories that unleashed these ignoble spawn upon unsuspecting Star Wars fans and a battered Star Wars universe only mention brains, so I will go with those and preserve the tiny, tiny dignity of the Anzati. They call brains "soup" and each soup has flavors that they can detect from a distance. The short stories feature a subplot about Hookah Man wanting to feast upon Han Solo's soup suck his brains out, because his brains are special brains that would taste extra-delicious. He then throws a murderous fit when Solo escapes with Luke and company. The author was dedicated enough to incorporate the vampire cliche of poorly-veiled homoeroticism, of all things.
"But how do these magnificent additions to Star Wars feed upon the brains?", I can hear you thinking. The answer is simple. They have a tentacle concealed in each cheek, and when they feed, the tentacles come out, and they shove them up their victim's nose to suck the brains out. Envision the geometry of a tentacle running from a human cheek to a nostril, and consider the sounds that must be made in the process, and retch or giggle according to your disposition.
Now that we're talking about the biology of these critters, they also have no biometric readings. This is taken as no pulse or heartbeat (apparently they don't breathe either despite being able to smoke), but I like to think that it applies to DNA/genetic coding in general, fingerprints, or retinae too. They're supposedly billions of years old and view the Force as a quaint superstition. They can hypnotize victims. Their first representative, Hookah Man, is an assassin. At least they can't turn anybody else into vampires Anzati by bloodsucking brainsucking (I like to think this was to forestall the inevitable jokes), nor do they lack reflections. The jury is still out on whether they have weaknesses to space garlic or transdimensional omnisilver. Finally, apparently if a Force-sensitive Anzati brainsucks another Force-sensitive, he gets the power of that Force-sensitive. Ripping off White Wolf, eh? Stay classy, EU. Stay classy.
The Anzati also hold the dubious distinction of being the third-laziest alien to cast in a film. You just cast a regular guy and make a pair of prosthetic tentacles if he ever has to bite brainsuck anybody (or you could even use shadows). By all rights they should be second, but that is another story (and another stupid alien species).
Overall, the Anzati are dumb, unimaginative, and contribute little to Star Wars. However, until recently, nobody remembered them. They had an appearance (from the same guy) in two short stories, a kid's book, and a misspelled mention in a novel. Now, they appear in comic books more frequently, but still, they're not particularly prevalent. Most of the dumber aliens aren't, because most EU authors managed to realize how bad they are.
Feel free to add your own!
EDIT: Added a little more material.
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