Another Classroom, not Death
'Sirius!' was the desperate cry of a near-sixteen years old girl as she followed him into the Veil at the Ministry but he vanished first before she got in...next thing she knew, she was falling upside down into a brightly-lit classroom full of oddballs in uniforms looking at her in disbelief and her head hit something.
'Ah!'
'Ow!' a man cried before both were knocked out and she never felt that rough desk landing...nevermind the fact that everyone can see her panties.
'Why can't her underwear show more, it covered everything!' a midget with four shiny balls on his head complained, earning him a tongue-slap from a wide-eyed girl not far from him.
'It's called 'modesty' you dumbass! With a school skirt like that she'd wear those!' a spiky-blonde boy yelled irately.
But still, everyone thought, 'granny panties'. High hips and covered a lot as well as plain black in color.
The masked boy at front was the first to stand and cover her up with her black robe.
'Iida, go get Recovery Girl.' he said. 'Both have concussions.'
xxx
Iida, a boy with glasses didn't just call the local nurse but also the Principal who brought in the cavalry. A masked cowboy did a body check and only found a stick, as well as unusual coinage. That was it. On the classroom floor were the downed individuals. Not only that, her clothes suggest she got into trouble and fought back since she has minor injuries and rolled around in a dirty place.
'So you're saying not long after USJ, a foreign girl appeared through a shimmering silvery haze above Aizawa and unwittingly knocked him out with her own head?' Nezu asked the class.
'Yes sir. She was just as surprised at ending up here before KO.' said a tailed blonde. 'She must be a student from another school...'
'I doubt that. No school in the world has a uniform like hers, young Ojiro.' said Nezu. 'Much less a really impractical accompaniment like this baggy black robe.' he said as woman clad in suggestive tights held up said article with distaste. 'It's a safety hazard, easy for enemies to get you. Judging by the material, she must live in a cold place whee heaters barely work to compensate but for a Hero School, it's like saying 'kill me first' because 'I'm the easiest to catch'.'
'This weird stick passed the detector I have, it's not a weapon.' said Cowboy. 'It has her name on it...one weird ID to say the least.' he commented, looking at the stick. 'Her name is Willow Potter...we can call her Yanagi-chan for now.'
'That can get confusing, I have a Yanagi Reiko next door...' a man clad in red with a fanged underbite sighed, scratching his head. 'What's her last name? Potter is it...Kamamoto then?'
'Where's your creativity?!' the old granny rebuked. 'For now her last name can be Nakiri. She came from a misty entrance and sounds better. At least until we can determine her origins with thorough exams.'
'Well, wait for your next subject as Homeroom is clearly over so soon!' said Nezu cheerfully as the teachers took away the downed pair.
'...now what?' a certain green-haired boy squeaked.
'...we'll be bored until Mic-sensei comes in.' said a girl with jacks for earlobes.
'Yeah, she's the most interesting thing we got since USJ yanno?' said another blonde with a black bolt streak on his hair excitedly.
'Well...that remains to be seen on how long she'll be here.' said a pink-haired girl wryly. 'That's the question.'
xxx
Police arrived to take DNA samples for investigation as well. Biological Investigation, Quirk, and Origin.
Hours later...
...nobody in the world has links to her in ANY country.
The most they can get, was her biological information and her name.
Safe to say, she was a civilian with unusual origins at that...considering she wasn't like them. Her looks alone, and biological investigation revealed she is 'a lost ancestor' from a distant past, before Quirks came to be. That was the summary in layman terms. Medical mumbo-jumbo? Don't even start...
She was a human from before the era humankind evolved to gain Quirks. She has a toe joint and all and nowhere to go to. Probably can't even speak Japanese so they had to get a Language user to help her out. And she's now UA's ward.