Biography
Cinder is... a person with difficulties to connect with people. She doesn't show a lot emotion, but she is a woman of actions over words. Unfortunately her way of not speaking much, which many people call "odd" or "weird", made many people avoid her, even when she puts herself in their way to volunteer to help them. As such, she never had any friends. That is, until Max and Veronica one day approached her, and asked if she wanted some company. From that day on, her life changed forever.
Nowadays, she has many people to talk to within the group, but her bestest friends will always be the au ra and elezen girls that came to her and wanted to be friends with her.
A Hair Predicament
Cinder doesn't actually have grey hair. She has segmental vitiligo on her scalp, and she absolutely despised the irregular patches of gray hair. As such, she decided that it would be much easier to just dye the whole thing gray, including eyebrows, and be done with it. Not only she thought she looked better with gray hair compared to her original color, it also made people seem to be at least a tiny bit more interesting, from what she felt.
Fate
Cinder, Max and Veronica were once asked
"If you could remake the world where a concept would be the most important, which would it be?"
After some deliberation, Cinder came to the conclusion that her answer would be "Fate". If people could see what the future holds, everyone could ensure a happy ending. The warmth of of companionship would be just a choice away, and no more would people like her fear choices and the future, because they would be able to see what's to come.