Warning: This story jumps all over the map of Ariana's life. It also details the experiences of an individual with PTSD, and so, I will also claim "TRIGGER WARNING" for references to rape. DO NOT READ THIS IF IT WILL UPSET YOU. This, mixed in with all the headcanon I've built up around her. And yes, my Ari speaks in complete sentences :P Mostly.
Disclaimer: I do not own Ariana (though I wish I did) or anything related to Harry Potter. I am NOT J. K. Rowling.
Ariana "Ari" Dumbledore
Age: Varies… mostly in pre-teens and during the time that Grindelwald was around.
Likes: Cold air, midnight, nature, Tales of Beadle the Bard, big warm blankets, autumn, flowers, knitting, the stars, Abe, animals and not being scared.
Dislikes: Being controlled, losing control, being afraid, loud noises, arguing, shouting, bullies, being called crazy, hurting people, vomit.
Treasures: Her hummingbird ornament, her glass bluebird, her stuffed dog named Megpenny, candles, her pillow with blue roses on it, the wooden flute Abe gave her.
Strengths: Clever, determined, compassionate, sweet, inclusive, generous, forgiving and entertaining.
Weaknesses: Insane, fearful, sheltered, naïve, overreacts and lashes out, quick temper, horrible past, cannot handle conflict.
Drive: She is not driven toward anything but being a Mom.
Needs: Security above all else.
Biggest Fear: Losing control and hurting someone.
Deepest Desire: Herself, stable and doing well in school, free from the house, with her family and friends feeling very proud of her.
Ariana lives with her two brothers, Aberforth "Abe" Dumbledore and Albus "Al" Dumbledore, their parents (occasionally, depending on the time the chapter is set in) and gets visits from Bathilda Bagshot and her young nephew, Gellert Grindelwald (again, occasionally). They live together in a wooden cottage in a small village called Godric's Hollow.
Because of her inability to deal with conflict, Ariana has had a hard time in life. It doesn't help that she has also been through more abuse than most people have – between her parent's sheltering & control, the bullying of other children and the guilt of feeling like she pulls her family apart, Ariana has developed many problems. These mainly lie in disassociation, false memories, delusions, extreme anxiety, repression, and Magic that runs amok from her whenever she feels a strong negative emotion, especially guilt or shame. Because of these things, Ari spends most of her time at home seeking comfort – which can be very difficult with two very different brothers, one of whom having a tremulous relationship with her, while the other is distant.
But basically, Ari tries. It doesn't always work out well, but she tries.