Princess Snow Star
Princess Snow Star is the student Twilight turned into an Alicorn many years ago, but she grew bitter and angry that ponies loved Twilight more than her, so she wanted to rule over Equestria on her own and tried to overpower Twilight to no avail. She now seeks vengence as an evil pony known as Ice Heart. Once she's changed back, she is a sort of shy Princess that tries hard in what she does and hopes to be a good mentor for ponies in the future. She is best friends with Twilight.