Is this a good sonic character idea her name is Luna the raccoon can control dark with her magic she uses a sword and she is good if can think of a better name include that in your answer

Yes, That is a good name for her, but I have a better idea...
Let her have a sword of light, and have her shadow stretch and control anyone who comes in contact with it, and her sword of light can cut through shadows and pure darkness, which could be controlled by her will.
(And it's up to you on where to go from there)
As for the character herself, have her eyes change color according to her mood like a pair of mood rings. And have her mostly pure white with black stripes for fur. Her paws should be black, but have her wear white gloves and her shoes should be one half black, one half white, and reversal with the other shoe. Making one color match on opposite sides.

That's all the ideas I have for now. idea #2 good name and idea and her fur color could purple and her clothes could be like a kimoto stile shirt and and pants and her sword can be called the lottas blade and like the idea above her eyes change color according to her mood but that is the only idea i like from above sorry