I was listening to Control by Halsey a while ago and I accidentally thought of Rumi to it. Like, a Rumi who survived the whole break in incident, but the trauma corrupted her, and gave her a Palace. A Rumi who feels like her life is spiralling out of control because of said trauma, and who tries to get back a feeling of control by controlling others through fear and aggression. What do you think about something like that?
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Oh, I LOVE the concept of Rumi spiraling out of control and possibly having a corruption arc after the break-in incident!!
I don't really know if you've seen it, but if you're interested in it, you might like @inkpens-coffee's Rumi Palace AU! Your timing is actually really funny because I was just thinking of Wilting Sage like two days ago, haha. Though it's not the exact same idea since it focuses on Rumi being awfully possessive over Takuto, it's a fascinating dark!Rumi AU and I think this song actually fits the idea pretty well :)
And listening to this song is also reminding me of my Rumi-centric CXGF AU! Season 3 vibes, anyone? No? Okay, I'll stop making CXGF references now. Just take my word for it, it fits her.
Oh, and this could also fit my headcanons for Shadow Rumi! Her Shadow is very egocentric and selfish and tired of playing nice, haha. Though I imagine that this wouldn't be as much about the shadow itself as it would be about Rumi's feelings while or after facing it, since her shadow is the part of her that doesn't feel as scared or sad as she is bitter and angry, because, to her, fear and sadness are acceptable emotions to feel in this situation, while bitterness and anger aren't. That especially goes for resentment towards people or things that can't be blamed for the break-in incident at all (especially Takuto... neither of them is having a great time, I swear), so she’d have trouble trying to reconcile those parts of her...
But I'm veering away from your original idea far too much, I'm sorry! My point is, I really like both the idea of a Rumi corruption arc and the idea of her having to grapple with the uglier side of trauma, you know? Especially the feeling of being afraid of yourself, of becoming just like the people who hurt you... Her wanting to have control over her life and protect herself as a defense mechanism but not realizing that she's going too far until it's far too late to go back... The guilt! The terror! The self-hatred! It's so painful and dark and fascinating and hhhhhhh it's such a good concept.... I love it so much... :')