Darling(15) is not destined to a specific story, and rather is supposed to be some nameless Damsel in distress.  She is a student at Ever After High, a younger sister to Daring Charming and twin to Dexter Charming. She appears to be on the Royal side of the conflict.

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I would like a voice match to Marieve Herington but if you want to put your own spin on Darling, I am open to interpretations!