Eren

Eren is introduced as an antagonist, but he switches sides and joins the Heroes. He is an OC played by Cor.

Information
Eren is introduced as Sekkai's partner, both of them working for Overhaul. However, at the end of the Foreshadowing Arc, he switches his allegiance and sides with the Heroes.

His quirk is not revealed until after he joins the Heroes. He is able to regenerate his own damaged cells, and quirks only work on him if he lets them. It proves to be useful in a few occasions.

At one point, he recognizes the blue rings on rescued hostages as bombs. He goes outside with them and uses his own body as a shield, being unaffected since the rings were made with a quirk.

He dies during the V!Todoroki Arc, being stabbed by Saiko as she went for Overhaul. However, Siren brings him back to life a bit later. He says he can cross dying off his bucket list now.

Backstory
Eren's backstory at this point in time is largely unknown. However, it is revealed during the WW3 Arc that he had a sister, who was killed by Zukan.