lost chars

I lost my only diamond Character and is there any way I can get her back or a new one?

So there I am, as a good father, teaching how to play skullgirls to my daugther. And she likes it!! And she keeps playing for a bit, and then... I realize many of my chars are goneee!! I know is my fault because I didn't favorite them. So, well... If nothing can be done, I will understand...