My Hero Academia's Vigilantes spin-off has been drawing a lot more attention from fans of the mainline series lately as it has been exploring Aizawa's past during his time at U.A. Academy before becoming a pro hero. This new arc has revealed some important elements of his back story such as his mysterious friend Shirakumo that he refuses to talk about in the main series, but has also revealed crucial elements of the pro hero Midnight's past as her time in school heavily involved Aizawa. But along with the introduction of a teenage Midnight to the series came the introduction of her incredibly NSFW early hero costume.