Dragon Blade

All it takes is one mutated Quirk, one with the rare ability to summon beings of energy, and two worlds collide. Hitsugaya Toushiro, deeply scarred by his experiences in the Thousand-Year Blood War, is thrown headfirst into the My Hero Academia universe. And it isn't long before the U.A. takes notice of this mysterious fifteen-year-old and his unusual Quirk(s).

All Hitsugaya wants is to head home - and quickly, before the hole between dimensions allowing Hollows to come to the MHA world becomes permanent, and before the strange spiritual buzzing surrounding All Might and Midoriya Izuku affects him irreversibly. But the League of Villains and the unknown figure that guides them knows this.
It's a good thing Izuku isn't going to let any of his friends go without a fight.

Cross-Posted on Fanfiction.net and A03

NOTE: Author isn't up-to-date with current BnHA manga and therefore this fic will likely be ignoring more recent reveals