Born the middle of the triplets. Mila loved her family and their strange life in Westview. The smallest of the triplets, during their advanced aging within the Hex she could often be found chasing after her brothers. The death of Sparky hit her hard, causing her abilities to start to show when she caused several neighbours to start crying.
During being babysat with Agatha, Mila had snuck out of the house to find Vision as she missed her dad. So she wasn't there when the boys were locked in the lair.
When the HEX was destroyed, Mila was asleep like her brothers. When she awoke, she was in a strange place and in a body that was a bit older than the previous and over the next three years, it took a lot of getting used too. The family she was now with were very caring and understanding that she didn't have any memory of them and got her special tutors to help her catch up with school.
She always felt different though, like the form she was in didn't quite match her. That there was pieces of her missing. She couldn't pinpoint what was missing, just that it was, that she wasn't quite complete.
It wasn't until she was stood up on a date in her senior year of high school that things started getting weird. Her mother was trying to calm her down, but she couldn't understand why no one was as upset as she was and as things started falling over on their own, her parents eyes glowed orange for a second before they started getting angry at the girl who stood her up.
Mila realised that she caused that, leading her down a rabbit hole of research and coming to the conclusion she was a witch. Still that didn't explain the ache and longing in her soul. She practised more and more until she could control the flying objects when she was upset and trying not to influence people with her emotions when she was feeling big emotions.
Then came the body manipulation. It started small, a different shade of hair, eyes changing colour, changing an outfit. She can't control that ability yet, however it is strongest when she is scared.
When Billy's sigil is broken, even from afar, Mila feels the change and starts looking for the source of the change.
**Going to do a rewatch of Wandavision soon to add more to this!
HEADCANONS - HERE // VISAGE TAG - HERE