Jane Doe

An unidentified woman, known only as "Jane Doe" and dubbed "Bizarro" by Cat Grant, is a brain trauma patient that was transformed by Lord Technologies into a clone, of sorts, of Supergirl.

Biography
The woman was kept in a locked room at Lord Technologies, where she was kept on a drip (containing black liquid) following brain trauma and significant arm injury. Maxwell Lord approached her comatose body, promising to help her, and she awoke from her coma with solid black eyes. It is later shown that this girl is turned into Supergirl's form, albeit with disappearing black eyes, and given Kryptonian powers, with heat vision and super breath being flipped to freeze vision and fire breath. Lord uses his control over this false Supergirl to command her to kill the real one.

Powers

 * Super strength: Bizarro is much stronger than a normal human and equal to Supergirl, allowing her to fight on par with the latter in combat.
 * Super speed: Bizarro is able to move much faster than a normal human.
 * Flight: Bizarro is able to fly and levitate like a Kryptonian.
 * Invulnerability: Bizarro is resistant to nearly any form of physical attacks or damage that would kill or damage a normal human.
 * Fire breath: Bizarro is able to exhale fiery blasts from her mouth.
 * Freeze vision: Bizarro is able to shoot purple bluish freezing beams from her eyes.
 * Green Kryptonite Immunity: While causing her damage, the green kryptonite doesn't weaken her. Instead, it makes her stronger, according to J'onn.

Weaknesses

 * Blue Kryptonite: Regular green kryptonite may cause her pain, but also physically mutates her appearance, degenerating and corrupting her body, resulting in her skin turning a pale, grayish white with cracks and her eyes to permanently become black. A blue version, a compound with an exact opposite molecular structure of kryptonite, is able to harm and subdue her. However, it also caused her to become calm, rational and understanding, resulting in her accepting being put into a coma to not endanger others and herself along with asking for forgiveness from Supergirl for her actions.