Will Mirio Togata Die?

After all, Mirio lost his quirk during his final fight with Overhaul as he was hit by a Quirk Erasing bullet. The hero, who also goes by Lemillion, sacrificed his power in order to save Eri.

Does Mirio get quirk back?

Mirio Togata, aka Lemillion, gets his quirk back after a long 6 months hiatus and returns to the frontlines to save a million lives, as promised! Eri manages to use her quirk “Rewind” to bring Lemillion's Permeation quirk back in Chapter 292 of My Hero Academia.

Can DEKU defeat Mirio?

While Midoriya doesn't really stand much of a chance against Mirio normally, if he has Eri with him, he could potentially win. ... With Eri's help, Deku can go toe-to-toe against Mirio, and maybe even beat him. Eventually, Midoriya can fight Mirio on his own as well, but that's still a long way into the future.