If City of Emptiness Shiro and Ichi got forced to go to Hogwarts there would be There May Be Collateral Damage hijinks, but also, Shiro would get sorted into Slytherin and then just stage a full rebellion.    Like, deciding that putting half of his house in the hospital, while fun and probably good for taking down a few of their egos, is not a good idea, so he’d hang out in other House common rooms for a bit then decide to make his own House entirely, stealing those who also don’t feel like they fit in their House.    Purple and copper, maybe, and definitely a chimera as a symbol, but he hasn’t decided on a name yet. “There are tons of empty rooms around.    I bet we could just steal one.”    Which he absolutely skips class to do, because he’s bored and hasn’t gotten to fight yet.    Ichigo, being the slightly more logical one, points out that they could get in trouble without a Head of House teacher who knows where they are in case of something like an emergency evacuation, and Shiro narrows his eyes, thinking.
“Hmm.    I’ll ask around.    If all else fails I can probably bully Binns into it.”
And he absolutely would stand up against the teachers, even Dumbledore, if he has to, because screw this pitting kids against each other for no reason noise.