Oh, God, such a wonderful question to answer!
I have been RPing for about 3 years now, and I can remember the very first OC I ever made.
The original to one of my all time, very feisty French grils, Chris. Originally, she was a Goddess of Negativity, able to control anything negative, and as this varies from person to person, it’s hard to explain, but she could show you the things you feared, and deal with your negative emotions. But only the things the person had a negative connotation to.
Eventually, the RP i used her in died out and then came another chance to use my beloved character. In a demonic sense, I changed her from Goddess, to demon, daughter of Satan himself, in which she had to save the world many times, and lose those close to, also having to kill her best friend who she felt like was a brother to her.
Then, that one died out, and I was at a loss. I loved this well developed character, and then came the chance to use her yet AGAIN, and I was thrilled. And this time, not much about her changed except her abilities, she was more into dark magic, and slowly just used any kind of magic.
Chris is my oldest, and maybe I’ll answer this prompt again sometime in the feature with another one of my beloved characters, or maybe one that was a necessary evil.