Strawberry Hart

Oh all the spoilers that could accompany this character, but I will resist and not post them.

Strawberry Hart showed up in ponyville one day with her sister. Nopony knows where they're from. Both keep to themselves and keep out of the way. Both are helpful to everypony and ask nothing in return. Strawberry's sister has made a name for herself as a doctor.

Strawberry has no cutie mark, and while her sister seems to know why, she keeps it a secret, changing the subject every time it comes up. Strawberry is gentle and quiet, and her sister takes care of her. Strawberry is weak, and it has been determined that she would be incapable of survivng on her own. Although both sisters are excelent in healing and medacine, neither has any explanation or help for whatever ails Strawberry.

That's all the info I can give right now without spoilers galore.