Aizawa, the man Sans respected out of the many power houses in this world, was pressed down against the floor, surrounded by many unconscious and beaten up people. On his back sat a man, or some sort of creature, so tall even All Might was considered short in comparison. This guy wasn't going easy on Aizawa, either, having twisted one arm so far back the bone was obviously broken. His clothes, usually black, were now red from blood.
"Stay back!" He was quick to turn towards Sans, eyes wide. "These are villains!"
"Oh, we have a visitor," A voice hummed.
The other was a man, in his mid twenties, with light blue hair and several hands pressed against his body. Seeing dead hands stylized like that made Sans take a step back, swallowing thickly. Monsters turned to dust, but humans didn't. It was always a little gross to see rotting, dismembered parts. Especially on someone's body.
"The quirkless child seemed to have brought a friend, one that appeared out of nowhere. A teleporter quirk, huh," He mumbled, starting to scratch at his neck. "Warp gate, you useless piece. If he wasn't our ticket around I'd tear him limb for limb."
Two people, and this guy was probably talking about a third. No students around, in the open at least, since Sans could see three people floating in a nearby body of water. Broccoli. Frog girl. Pervert teen. They were staring in horror and shock, and some drool in Mineta's case.
"Shit," Sans cursed under his breath, using his magic to feel for the creatures soul. It had one, a weird looking one, but a soul nevertheless. The moment Sans managed to grasp it, he ripped it to the side, effectively slamming it into blue haired handy boy, as Sans called him, and quickly teleported over to Aizawa's side.
"Holy shit dude, what the hell happened?"
Aizawa was not in good shape. Not only were several of his bones visibly broken, one of his elbows was cracking, almost decaying in a sense.
"They're here to kill All Might, they... that thing is powerful, stay away from it," He said, though his voice wavered, dropping in volume. His eyes blinked rapidly, trying to keep himself awake. "You need to grab the students, get out of... here... please..."
Sans gently let him lean against his body as he passed out, head lolling back. That wasn't good. At all.
"Two quirks, that woman had two quirks," The handy man growled, starting to scratch at his neck. "Bastard... Father, she has two quirks, she's fast, I didn't even see her move..." He dug into his neck further as Sans helped the homeroom teacher onto the floor, setting him down slowly. "We're losing, we have to withdraw, All Might isn't coming."
He seemed to be complaining to himself like a whining child. As he continued to scratch at the side of his neck, he muttered, watching Sans with an intense gaze easily warranted to one of bloodlust.
"So you guys are withdrawing just because I showed up? Man, I feel kinda offended," Sans said, looking across them. One of them had strength, that seemed to be his quirk. The other remained undetermined. Best to keep a safe distance from strengthy for now. "But hey, I won't stop ya."
"Nomu, deal with this person, I want to send All Might a message."
As the big beast rumbled forward towards Sans, he saw, in a flash of speed, the blue haired man suddenly appear in front of the three students. One of his hands outstretched towards Su's face, and he could see a terrified expression cross over the three as it got closer.
Clearly this guy had some quirk, then. And something bad.
Sans let his magic rush over him and quickly appeared right between the two, giving him no time before the hand intended for the teenage girl behind him instead lay across his face.

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Not a Hero, Not a Villain (Undertale x My Hero Academia)
ФанфикAfter a genocide run, when Frisk decided to destroy the world, Sans' soul didn't make it back. It ended up inside the body of a woman, who'd quirk was to destroy her soul and place another into her body. Now, in the body of a woman, with no money, n...