If we aren't allowed to choose "human," then I'd love to be a Pakled.
Such a simple, uncomplicated people.
Wouldn't be so fond of being a Vulcan though. Quite the opposite of the Pakleds. Pakleds eat when they're hungry, sleep when they're tired, poop when they have to poop, and look for things to make them go the rest of the time. Vulcans spend too much time with ritual and logic and emotional suppression. They're a very uptight, annoying people.
Vorta. Its such a simple life if you know from your genes what's right and wrong. *waves at Bajor* Hey, look, if you wanna be religious zealots, do it the right way. All or nothing, enslave the galaxy, crusades, all the way. Beginners.
Ferengi. Nothing beats being obscenely rich. I'm also very fond of having very sharp teeth and the prettiest clothes in the universe.
Nausicaan - Teeth. I dig sharp teeth. And the sweet pirate life. Since I already said Ferengi, it can be assumed I have no honor, so I'm disqualified for Klingon - but I'd still not say no to kicking asses with some primitive blade weapon.
Breen - The best of all worlds. Well, except pretty clothes.
Hate to be:
Bajoran. You fill in the reason, you're most likely right. All of you.
Caitian. How much time I would waste to shave my legs! *shudders*
Kazon. Must suck to be a bad Klingon replacement species not even worthy to be assimilated.
I'd love to be Cardassian, nationalistic militant culture yet also possesing a great appreciation for the arts, history and literature, not to mention a great sense of style and one of the top education systems in the whole quadrant.
Hate to be Pakled... really who wants to be short ugly obese and retarded.