This is a Anglaroo. A anglaroo is a cross between a kangaroo and a anglerfish. As you can see, she possesses the kangaroo characteristic of a tail and marsupial face. Meanwhile, she also possesses the darkness and glow of angler's distinctive bioluminescent antenna.
Her name is Bathsheba, and she is a mathematician. She makes beautiful math sculptures and has a home page at: http://www.bathsheba.com/.
Bathsheba riding a banada. If you are there, you'll see that she rocks it left and right. To the right of the banana is a ray fish. On the left is Seifert Surface, another mathematician, whose creations can be seen on the page Math in Second Life.
Note: the Anglaroo avatar is made by Synchra Squeegee and may be purchased at Dragon Keep.