You are a vigilante that was almost caught in Shigiraki's decay earlier in his battle against Izuku "Deku" Midoriya, you see Deku using float and blackwhip as he pummels into Shigiraki, and as the vigilante you are...you rush over to help the heroes, dashing past heroes and slashing villains down as you rush over to where Deku and Shigaraki are, also yes, Bakugo hasn't been pierced yet

Mirko: Is that...?

You jump up and latch onto Deku's blackwhip

Izuku: Too focused on fighting Shigiraki

Shigaraki: IS THAT ALL YOU GOT HERO?! is on the defensive