Power Girl (New Earth)

Last survivor of Argo City, the cousin of the Man of Tomorrow, Kara Zor-El herself.
Portrayed by: Melissa Benoist
Secret Origins: As Krypton was being destroyed and Kal-El's parents sent him to space, his uncles, Alura and Zor-El sent their own daughter Kara in a ship of her own to go along with Kal and protect him. While Krypton exploded and Kal-El was heading to space, Kara's ship entered a black hole for 20 years, by the time Kara got out and falled onto Earth, Kal had already grown and becomed Superman.
Without a need to protect his cousin anymore, Kara took refuge on Earth, passing as Clark Kent's cousin and living alongside Kal's adoptive parents. At first Kara didn't gain Kal's abilitties as she was exposed to a yellow sun, being only able to jump great distances, minor invulnerability and speed, eventually Clark along with some help with Bruce Wayne would discover that Kara was affected by the black hole, causing an effect in his DNA that dicreased her abilities, though Bruce came to the conclussion it might be temporary.
Girl of Steel: Eventually as Kara's Kryptonian abilities started to manifest in a more powerful manner as she was now able to fly and use heat vision as her cousin is able to, she took on the identity of Supergirl.
A few months after starting her carreer as a superhero, Kara along with other young heroes of the like were invited to the Justice League's training program for young heroes, the Titans, becoming a member of their second generation.
Power: As time passed on, Kara's powers started to further evolve due to her exposure to the yellow sun, eventually allowing her the unique ability to unleash most of her solar energy outwards like an explosion at cost for her powers dissapearing for a entire day. However, this powers started manifesting as what many believed couldn't happen. Superman was killed.
Kara felt guilty for the death of her cousin as she herself was taken out of the fight by Doomsday and wasn't able to hold her own against him, eventually after the funeral, Kara decided that to honor her cousin she'd take a new identity and leave the mantle of Supergirl, oficially becoming Power Girl.

Notes:
Okay then, as you may have noticed, or not, the design is mostly based if not just a micro version of Femmes-Fetales Supergirl Redesign (with a few modifications as for it to match a bit more closely to my Superman design)
Along with the white suit, i added a variant of the classic blue suit, the explanaition: In canon, the blue suit is her original suit for the first months as Supergirl, the white suit is the one she adopts as she becomes a Titan and starts become more independent from Superman (plus a bit of fore-shadowing for one certain powerful woman, wink wink, nod nod )

Credit to  and . Costume based upon  original redesign
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Nova20X