adia loves and hates her father... What a vibe lol
Yeah, Adia and Hubert have a complicated relationship. When she was younger he spent most of his time working - consolidating a continent wide imperial regime is a difficult task, and Edelgard needed his constant assistance as her hand in the shadows, not to mention the war against TWSTD. Adia looked up to him as her inspiration, and the lack of supervision meant that she got into documents and things that she ought not to have. Of course her mother was there (unless her mother was Edelgard, which will compound her problems) and her aunt (the sister in 3Hopes), but they all had busy lives too.
Most of the time she was able to spend with Hubert was when he took short breaks from roaming the continent, and taught her magic. He was always so proud of her - and felt the most comfortable to express his love - during those lessons, which motivated her to become more useful to the empire. He jokingly called her “my precious asset” once, and it never really left Adia’s mind. Hubert regrets that now. Adia mistook his pride and excitement over her magical growth as the reason she was loved, and began equating usefulness to the capacity to be cared for.
Hubert for his part deeply loves Adia, he viewed his work as important to creating a new order - one especially made for his daughter. He threw his affection for her into his work, determined that he should complete imperial power consolidation quickly so he could spend time with her. As the years passed on, Hubert never realised it was getting too late to do so.
Adia discovered her passion for Agarthan magic and technology, as well as fascinating biological experiments when she was young. Some of the documents she read talked about them and their help in the war. As she began helping her father, she became more intent on studying it. Paired with her desire to be an indispensable asset so she would be loved, she tried out minor experiments on herself.
It started off small, but grew until she tried the ritual mentioned in her character bio.
Hubert was appalled. The magic might spread, until it took all of her, or it could just stay as it was, still changing her mind and body to its whims. Hubert views her doing this as his single worst mistake. Letting his daughter experiment on herself is worse than letting Edelgard get taken by TWSTD, although both he deeply regrets. He now takes care of Adia on a regular basis, and employs others to assist him in continuing to help the Hresvelg’s with the Vestra's iron grip on Fodlan.
Adia flips between hating Hubert for letting this happen to her, to loving him for motivating her. She adores him and what he does for the empire, and despises how little time he used to spend with her. She's not really sure how she feels, and that is only muddied as she grows further and further from the woman she once was.