Please may I have Toilet-bound Hanako-Kun Platonic headcanons of what it would be like Realistically for the Amane brothers to have a younger sister age 5 who is a 8th Mystery of the school. She means no harm..but her domain was a snowy Tokyo town from when she died from an illness in the arms of her mother when the twins were 10 (she changed after that and who wouldn't? After a death of a child can do that to a parent) and like her elder brother who suffered from a illness defect before..the obviously canon events. Her victims do tend to get very sick if they wonder into the old part of the school of where her domain was..unless they dressed up warmly (someone learnt the hard way). She was very kind (she had tried to save someone before but they still had died)..but clearly wary of exorcists..she had several attempts made on her life. She is still 5 years old physically despite being one of the mysteries..mentally too..that was clear after Kou had accidentally made her cry Because she’s 5, her emotions aren’t contained.
So the domain reacts instantly:
Temperature drops sharply
Snowfall intensifies into a near whiteout
Ice starts forming on surfaces
Breathing becomes visibly harder
It’s a meltdown made supernatural.
https://youtu.be/PP8TBOewhGI?feature=shared (her theme as she is 5)
Amane Twins and Snow Wonder Little Sister Headcanons
I am deeply sorry for how absurdly long it took me to do this. Now, granted, I don't do headcanons often so I'm sorry if these aren't super good, but either way, I hope you like them. Once again, I'm so sorry for the wait, thank you for your incredible patience.
I think it’s not crazy to say that Hanako would feel a LOT of responsibility and guilt over his sister—especially since she died so young in order to become a wonder.
This sister of Hanako’s, while clearly meaning no harm, is definitely categorized as unpredictable. Therefore, he does his absolute best to keep things in order as much as he can, but he still can’t do everything.
He’d likely assign or ask Yashiro to subtly change the rumor just to make things easier for her since wonders have to adapt to their rumors to survive. He tries his best to comfort her to the best of his ability—but his own trauma sometimes gets in the way unwillingly.
He’d likely be incredibly protective over her because she’s literally the only family he has left outside of Tsukasa (and we all know why he’s a problem). I could very much see instances of where Tsukasa would even try to use her as leverage in some way, shape, or form against him—which raises the stakes further.
Hanako is known to be overprotective, even to the detriment of others. And sacrificing his sister is not something he is willing to do in any capacity.
Not only that, but her domain does pose an objective threat to outsiders who dare to go in unknowing of the danger.
No doubt Tsukasa would absolutely attempt to manipulate her and use her to his own advantage. And because Hanako often is overwhelmed with his duties, he’d use their sister’s loneliness against her by playing up the ‘more available’ brother act if you will. It unfortunately had happened before, but lil sis catches onto the game eventually—even reporting stuff to Hanako as per him telling her and training her to do it. So now whenever Tsukasa wants to use her, he has to plan it more thoroughly.
He’s definitely used the kid to cover his own butt when his plans fall through as well—pinning the blame onto her so others would think she was responsible and/or provoking her to act out in a way that makes her seem like she was.
Hanako deeply loves his sister because once again, she’s all he has left. And if battling Tsukasa to keep her out of harm’s way is the way to do it, so be it. But even despite his good intentions, let’s be honest—Hanako’s not known for having the best methods to handle stuff. So while he’d be better than Tsukasa, no doubt his sister would still be rather isolated as a result of having powers she didn’t choose.
