True, Rihannsu are about seventy-two times cooler but I just have a fetish for the pointy-eared and would just be happy to be either.
Can I be Thanos please? 
Well, if people want to take a wild-assed-guess, I’ll put my choice in a spoiler box. Hint - my name just might have a correlation to my choice.
A wolf of course !!!
If I had a second choice, a Great Horned Owl would be nice.
CRAP!! 
I’d be a Voidhawk, if you’re not awae of Peter F. Hamilton’s Night Dawn Trilogy, this is basically a living starship.
If I can’t have that, I wouldn’t mind being Dumbo, I could fly plus… I’m an Elephant B@#ch!!!
sorry, that Rick James joke has corrupted my psyche.
I’d like to be the Death of the Discworld and speak IN CAPITAL LETTERS ALL THE TIME.
What’s a Rihannsu? Some kind of Romulan?
And I think Elves are cooler.
I don’t think Thanos would get invited to many parties…
Fantasy-wise I’d love to be a shape-shifter. Feel like flying…let’s sprout some wings. Feel like looking mean…Grrr–Now I look mean.
For real animals, I always used to be facinated with squirlls. The way they leap from trees & telephone poles…the way the chase each other around…I always thought they were neat.
Of course, now that I’m grown up, I realize they’re gloified rats and pretty icky.
Kryptonian would be nice.
Um… you want to be a rock that Superman is afraid of?
(searches memory desperately)
Oh, right. Superman’s **planet ** is named Krypton, right?
Oh, dear. You desperately need basic comic education 101. 
Yes. The planet was Krypton; and the people, Kryptonians.
The only one that interests me at all are the X-Men! And they’re fascinating.
Superman is silly and has ridiculousy high morals and unfair advantages.
Batman’s cool, but he’s completely been superceded by X-Men.
And I barely know any others.
A DCU Martian. Shapeshifting, invisibility, intangibility, telepathy, and all of Superman’s powers.
See, I considered them, but Fire? Way too common in our world. Eliminated Daxamites because of the whole ‘lead’ thing.
Briefly considered the Guardians, but a nigh-omnipotent smurf is still a smurf.
Sadly, my initial reaction was that I wanted to be aids so that no one could kill me. However, further review of this answer sickened me and so I resorted to come up with an alternative.
I would want to be snowy owl. That way I could fly around, shit on people, peck them, and chase wood peckers and no could do anything about it because I would be endangered. Also, I would fill people’s mailboxes with dead squirrels. Man! I want to an owl!
What are you talking about? A liger is a real animal, just as is a tigon, and they’re not really bred at all, since those few that do occur (in zoos) tend to be sterile. They’re certainly not bred for their “skills in magic,” since, again, they exist in the real world.
wild applause
I wanna be one, too. We should start an owl gang and have a secret gang sign.
The fire weakness is psychological, at least in green Martians like J’onn, so it wouldn’t affect me.
Mythology: A Greek goddess. Athena would be good–intelligence, beauty, prowess in battle, mastery of the female arts (ie, weaving and other domestic stuff, not necessarily sex).
In the animal world, a dolphin.
Two flaps + 3/4 head swivel = Friend
One flap + two hoots and a screech = I see a squirrel:)
PS: I hate to pop the bubble, but don’t ligers also suffer from joint/spinal problems because of their size? I seem to remember that they are too big for their own good and are rather slow or clumsy, but that sould be from captivity.
Scarface Z,
I would have thought you wanted to be a bear.