I had thoughts help.
So. Magical Girl AU. 2 ideas. First one is one I've touched upon very briefly before, but I love the idea of Weather's initial rage not simply being darkness but instead an overwhelming light, that relentlessly burns and destroys/ensnails anything near him. The darkness that overtook him actually calmed him, sealing that destructive light away. (Also maybe the dark was tied to Perla somehow idk.)
Then Pucci showed up and misread the situation completely. So now not only is Weather devoid of dark, he also is lacking in light as well, since that's still sealed away.
And when some light enters him again, and weakens that seal... well. Nobody liked what happened after that.
2nd idea: Perhaps those possessed by darkness look a little... off. Unless their modus operandi depends on going unnoticed, like Kira, they have some feature that twists their appearance, different for each person, and growing more pronounced the longer their body remains darkened. I imagine this would make the part 5 and 6 designs very interesting. :)
YESSSSSSSSSSSSSSSSS
tbh, this AU is rotating really hard in my head and this is P E R F E C T
for the first part, I had an idea to both make it better and worse :>
so as I mentioned before, humans and most Earth Creatures in this are naturally born as beings of Light. However, what if while they can be corrupted by outside sources of Darkness, it's also somewhat..... natural, so to speak. Pain, fear, anger, even apathy, those feelings all make it a bit easier for Darkness to be inside them, but in healthy small amounts. Light meanwhile has more to do with emotions like happiness, determination, justice and can drive it back.........
so what if before his memories were taken, Weather completely gave into his newly unlocked Light. His Light that was once righteous and warm because burning and scalding, driving away the Darkness that would've been the balm to soothe his grief
Pucci (albeit accidentally and unintentionally) giving him this all powerful Light in the middle of his grief took away his ability to process his feelings and what had happened with Perla. These feelings toward tragedy are natural, healthy even, and necessary for the healing process. Instead, Weather got a bright, powerful but uncontrollable Light forced upon him that he didn't know how to use. He was a Magical Girl yes, and he wasn't necessarily a corrupted one, but that's simply because the Light burned too strong and bright to let it
The Light wanted justice, and in this case it was very close to vengeance. Perla was innocent and kind, and these people were hardly good. Perhaps they themselves were corrupted with Darkness, and Weather's own Light reacted to fight back, to protect, to try so desperately to keep him and what little he had left safe. The Light made him tunnel vision so much he didn't notice those getting caught in the crossfire nor the way his own body was slowly burning inside out. Didn't notice how his grief and anger and sadness where suddenly nonexistent beyond the desire to Do Good And Help By Getting Rid Of The Threat
Pucci awakening his power nearly spelt the end for Weather's life, had it gone for a few more hours
maybe that's also why Pucci brought him to Green Dolphin, hoping that the oppressive and constant Darkness will keep the seals firmly shut
this also raises the fun possibility of Jolyne And Co healing him not with Light like they usually have but with Darkness. Maybe Emporio could help here since he's been exposed to so much that it's basically a permanent part of him now, and in the process it helps balance himself out. They almost swap the excess power they have and finally get to be at peace
(also, I think for this bit I had a fun idea for the rain imagery. This whole time Weather is practically glowing, radiating Light constantly and the longer it goes one the more he begins to burn. His skin begins to crack in places, his eyes lighten to white, his hair begins to grow black at the tips and curl like it's been set on fire
((Actually hey what if Weather's hair is white because the overwhelming light from that one time basically bleached his hair))
but then....... when it's finally over. When they manage to douse the flames the overwhelming Light has brought, to give him Darkness to let him finally feel........ it gets cloudy and rains and finally Weather gets the chance to cry)
And shifting gears for the second idea, OF COURSE
Limbs and nails and teeth that are a bit too long or numerous, eyes that are a bit too vivid or have colored sclera, patches of skin that don't look quite right like instead they're scaled or leathery or just the completely wrong color, hair that seems to defy physics or sway in a nonexistent wind or not be completely made of hair at all, voices that have strange qualities and echoes to them, etc etc :)
Giorno and Emporio both grow up surrounded by those traits 24/7 and kinda got desensitized to it all. If anything, this is how people look and are supposed to be. To them, if someone looks normal they're an even bigger threat because that means either a) they're a trap and trying to get you to lower your guard and/or b) they're powerful enough to hide