We know what happened to the Lizardmen, so how about the flamboyant pointy-ears of the Asur. After the End Times and the events leading up to Age of Sigmar, some elves decided to go to the My Hero Academia World to recreate Ulthuan as told by their creators Tyrion and Teclis. Perhaps they could have diplomatic relations this time around... after reminding the mon-keigh their place.

Deeply pious, fanatically xenophobic, unflinchingly loyal, and dedicated to the Emperor and the Imperium, like a good Human, Izuku doesn't question the many issues that exist within the empire of Man. Finding himself faced with an alien race that is what the Imperium is supposed to be, he finds himself forced to question these traits.40K Trade fic,shipping extremely lightly implied

All Izuku Midoriya wanted, from his birth on Iax, was to be an Angel. A Hero of mankind, striding forth without fear. He'd earned the right to try, but a sudden offer by his mentor figure sends him not into the traditional trials, but a mysterious and motley collection being assembled by a powerful and shadowy figure on the planet of Musutafu... (Crosspost from Ao3)