Name's Tezno or Tez, I did make a wattpad account in 2020 but I'm starting off fresh with my new story "The Ultimate Rivalry"

Withered-Shadow is Wither's code name since she was a mistake and looked "withered" compared to the final design of Shadow. Her DNA was soon then used to make Shadow.
Soon after he was made, he tried to talk to Wither but she couldn't speak, she didn't develop her voice and kept fainting due to lack of proteins in her system.

After they came to Earth, Wither was abandoned whole Shadow left to protect the humans. Wither goes on to find her twin and get revenge on what he did to her when they arrived, She holds two chaos emeralds with the power she can use to fight her twin. Will she succeed? Who knows.

Also little info on Wither: She's bigender, she's masculine, she has hetrochromia due to her different eye colours (Green and red), her code name was "Withered-Shadow"