Although he's beaten all of them so far, the effects of each battle remain. All the damage the suit has suffered is piling up, resulting in its current ragged, ominous-looking state. Deku's outward look also reflects his troubled inner state.

Why is Deku a monster?

In this life, Izuku takes his darkness... and stands in the light. To prove that he's not weak as everyone makes him out to be. After all, things like him are never weak. That's why they're called monsters.

Is Deku turning into a villain?

Villain Deku is the evil version of Izuku Midoriya from the anime My Hero Academia. His bad ending occurs after an alternate version of events in the first episode.