Hutts for sure
Probably a close second is rodians, I can never seem to find them

@surf,
I too am "scraping the bottom of the species-barrel" for customising ideas lol.
Trandoshan's do have a big representation, but are over-represented as bountyhunters.
Dinosaur jedi (all sorts really) are pretty rare; T'Mikel, Jedi Instructor (really just a Coleman Trebor), Vrax/that other long necked species from some archaic RPG scenario.
Cathar are fairly low on the list too,
Maybe some bothans?

Also, those crystaline Iron Knights from the Tales of the Jedi era (NR i think) and some gas-like beings from the books are rare too.
I think you could just run a force spirit as a proxy in either case.

Clawdites are represented with 3 statcards; 2 of em are yours haha.
What about that 2 headed merchant from KOTOR? I dont know what species they are, but they look interesting.
Hope this helps,
And i'd call on any lurkers who've read any star wars lore over the ages to come forward with weird and wonderful species theyve seen over the years

vaagari, skytiri, Houk thats all i can think of right now

@surf
Ive done a little digging, and have come up with a modest list
I put a few stat hooks in after each entry; tentative ideas which hopefully you'll play with
http://starwars.wikia.com/wiki/Iyra
Darth Starro, anyone? haha Local GMs suggest this creature needs a robotic suit or a repulsor-field bubble to survive outside of aquatic environments. I think force bubble and some terrain modifying abilities would suit this character (like, treat all low lying or difficult terrain as impassable, save 11)

http://starwars.wikia.com/wiki/Celegian
Its essentially the SWEU version of GW40K's mind controller fringe character, (or those weird floating things from the Dark Forces saga). Known for battle meditation and mind tricks (pun intended on the part of rule writers?) Usually are natural leaders or gifted at information processing and sorting.

Dominate Mind seems a natural fit for a master of this species, perhaps with battle meditation or Jedi Instructor?
For a unique, could also be a CE/FP battery with Relay Orders, Force Renewal and Disruptive?.

http://starwars.wikia.com/wiki/Ergesh
"Dude, i don't think you pee'd on a bush..."
Ergeshi: "You're under arrest!!!" haha, a player at my LGS used to RPG as one, completely slipped my mind lol. They're great as stealthy players, or as illusion/persuasion based jedi (always get bonuses to affect mind and illusion)
Can also be related to the tree-like race, (Neti I believe?).

Could also alter terrain, get bonuses in difficult terrain, speed 2 or something and swarm.
A master could have some traps ability, or affinity with other Ergesh/Neti?

http://starwars.wikia.com/wiki/Pulra
Shapechangers of a different kind to clawdites, (sorta like flubber or ditto from pokemon, a non-newtonian lifeform) regarded by my GM as a cross between Gendai and Clawdites, but often with much less dexterity and intelligence. Pretty neat spys, and a local RPGer got a destiny point recently for plugging a hole in our freighter when it was attacked (they couldnt man guns or pilot, or repair, so it was cool to see them spontaneously come up with that)

These characters tend to be reactive; maybe reposte and jedi reactions on a large based mini?
I think they'd also benefit from Cunning Attack and a bunch of nasty powers to compliment them. Maybe regenerate for survivability or Combine (sacrifice adjacent Pulran character; this character heals for the amount of HP the sacrificed figure had?) or Consume (inverse).

Uniques could be fun; could have thrawn swap ability, for fringe? Could have shapeshifter or mimetic combat style...

http://starwars.wikia.com/wiki/Filar-Nitzan
Djinn-like, and often kept in a bottle or storage device when travelling with RPG parties, they make good spies and wicked force-users... A friend of mine made such a character years ago, basing it on the Thousand Suns lore... so it wore a 'possessed' suit of Stormtrooper armor.

Could be fun to come up with abilities/model this figure
Im thinking it could be a non-unique force ghost, (sorta like what Lord Ball came up with for the sith shade custom I made a long time ago...) functionally, with uniques being a force ghost. An army could just be possessed armors/vessels (like D&D figures of the same name)...

We don't have a Chev as far as I know, although they look pretty human anyway. They're a pretty prominent species to be unrepresented. Also, only one Chevin.

@Arrow - I've looked at Chev's; not much in the way of chev pic's, but I do look occassionally. Big foreheads and lidless eyes if you're looking to make a custom. I've done a few Chevin cards (Ephont Mon is the only mini) but I guess you could repaint Ephont if necessary.

@Bob - Quite a list you got there. It's gratifying to see that I've done cards on most of the list (and you've given me a few ideas.)If the custom mini guys could really look at that list, it would start some good discussions on how to make certain species ... maybe a topic for another thread .....

Thanks for the ideas.

Awesome list Bob, You Da Man! You gotta stay on top of surf's cards otherwise you get too far behind like I did and it'll take ya forever to catch up. That's the boat I'm in now.

Great topic Surf!!!

These guys remind of the Lizardmen from Warhammer, without a doubt one of the coolest species in Star Wars (I love reptiles)!

No, but surf has done several Chiss cards in his customs thread.

On a side note, without giving away what species, I've gotten 6-7 new species ready to go but can't decide their Factions. Some could be Rebel, some even Imperial, but it's getting annoying that like 95% of everything I've done the last few months seems Fringe, sub faction or not. Is this just the evolution of the game?

I've noticed even the V-Sets are doing a lot of uniques, which I'm trying to avoid, because let's face it, Stormies and Clones can have only so many variations. You can only have so many veteran, Elite, rookie, etc. of a soldier. Are we just going to rely on the ever expanding EU? I got a Fallen Combat Instructor from reading Plagius.