Ohhhh i love drawing characters of the serie with my headcanon for them, i am still working on Luster Dawn.
But for keep it simple, she isn't the daughther of any of the Characters in the serie, she's just avreally talented magic apprentice.
I don't know if she could be the next element of magic, it might be, for other generation, what do you think? (in my future, the new element of magic has to be decided, we have Jake, he is the older kid of Twilight Sparkle, the heir like everypony says, buttt there's someone else that can be neck to neck with him, and that is Astral Moonshadow, the second kid of Starlight Glimmer).
I love her design tho.
Mmmm i think that she might be that typical nerd girl who doesn't need friends, she did everything alone, all by herself, that's why i see her like a really strong mare, doesn't need anyone….but sometimes she might feel lonely..it's normal, but she doesn't care.
She's an only child, so she didn't get used to have friends around. (she has a dog plushie, she has it since she was a little filly).