Mirage is a member of the Team Titans from Killowat's home dimension. She has the ability to create illusions to confuse people. And a counterpart of her in main Teen Titans dimension who became a member of Titans North

Mirage and Flamebird in Teen Titans Go!
She is revealed to have a counterpart in the main Teen Titans' dimension in issue #50 Graduation Day Teen Titans Go!, living somewhere in Mexico/South America. She later joins Titans North along side Flamebird (shown in the picture to the left.)