This is hard too...

I believe that OC is Autumn. She started as lawful evil character because of the whole BBA story.

Autumn was kidnapped as lil child and got experimented on by BBA scientists, which transformed and brainwashed her into a succesful killing machine. So Autumn at first would never have her own opinion about things or a proper view of the world.
Then Athena (BBA forced bio-engineering scientist) tried to change her character because she could see good things in her if educated correctly. This slowly turned Autumn into a chaotic good character that does good but in her own way.

In CW, Autumn slowly changes her point of view different times. She will see the world differently from what Athena would describe it at first, which leaves her disappointed and confused.
Then when she lives inside civil society in Monopole City alongside with Allen, she will start seeing people and the world in a positive way. Allen's carefree and innocent nature will help the hybrid to see the good small things inside the big bad stuff going on in the world.

At the end of CW, Autumn will turn into a good character with a peaceful mindset and to live her long life at her fullest, leaving her past behind herself.

She will die naturally at age of 500 y.o keeping the same ideals like at the end of CW. When her family will be gone for obvious reasons, she will spend the rest of the life protecting her city alongside a small hero chao named "Eyeye".