Is there a book with a story similar to Princess Celestia and Luna's/a character similar to Luna?

Is there a book with a story like Celestias and Lunas from My Little Pony Friendship is Magic (ex. two sisters: one moon, one sun, one sister becomes

Is there a book with a story like Celestia's and Luna's from My Little Pony Friendship is Magic (ex. two sisters: one moon, one sun, one sister becomes lonely/jealous of the other, etc.)? Or is there a character similar to Princess Luna (lonely/awkward but still nice, feels outcasted from other people/her sister)? Please answer. Thanks!

or:Is there a book with a story like Celestia's and Luna's from My Little Pony Friendship is Magic (ex. two sisters: one moon, one sun, one sister becomes lonely/jealous of the other, etc.)? Or is there a character similar to Princess Luna (lonely/awkward but still nice, feels outcasted from other people/her sister)? Please answer. Thanks!

or:As far as I know i am not so sure but there is a book with mlp picturse and luna is called selena. Not so sure it will help.

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