Gemini de Mille is the daughter of Madame Rouge, Madame Rouge had her during a time when she was reformed.
Gemini tried to frame Gar Logan for murder and completely discredit him. She blames Logan for the death of her mother. She is thwarted by Beast Boy, Flamebird, and Nightwing. Subsequently, she joined her mother's old group, the Brotherhood of Evil .
Major Story Arcs
The New Brotherhood of Evil
Her first mission with them was an arms deal with the Penguin in Blüdhaven, but they were defeated by Batgirl. Since that time, Gemini had rejoined with The Brain and Monsieur Mallah as a member of the new Brotherhood of Evil to battle against Teen Titans.
Powers and Abilities
Gemini has the ability to shape shift into virtually any form. Her body appears to be comprised of rubber protoplasm, granting her an amorphous physiology. Gemini can also extend her limbs in much the same way that her late mother could.
In addition to her powers, Gemini can also perfectly imitate another voice.
Gemini has a weakness to fire.
Teen Titans GO!
A heroic version of Gemini appeared in Teen Titans Go! as a member of the Brotherhood of Justice, an alternate reality incarnation of the Brotherhood of Evil. She defeated and stole the identity of Blackfire in order to infiltrate the Teen Tyrants and bring the team down from the inside.