White Witch

Her real name is Mysa Nal, although her name was given as Xola Aq in Silver Age Legion stories in Adventure Comics; the revelation that her name was actually Mysa Nal was a later retcon. She is the sister of fellow Legionnaire Dream Girl and daughter of former High Seer of Naltor Kiwa Nal. Like Dream Girl, she is a native of the planet Naltor, where nearly everyone has the power of precognition; however, unlike most Naltorians, Mysa cannot foresee the future. To compensate for her inability to see the future, Mysa trained in the mystic arts on the planet Zerox, known as the 'Sorcerer's World' and became extremely powerful. 
She joined the Legion after helping them defeat Darkseid in the famous Legion story, the Great Darkness Saga.
I was inspired by Rosie Huntington Whiteley's gorgeousness. The BG it's from the site Wall Paper Pimper, I painted the crap out of it to make it look the way it does.
Long Live the Legion of Super Heroes and Victoria's Secret models.