Hogosha

An alternative universe; one where Eri activating her Quirk when in conjunction with Deku's Quirk as they fought OVERHAUL using his own Quirk, fused the fledgling hero with the young girl, turning a scared child, and a brave, stupidly brilliant, crazy teen into a whole new being! 

She bears the hero name Hogosha! It means Guardian, and that is exactly what she is, a protector to those who need saving, no matter the cost! Izuku Midoriya and Eri exist within All For One as fullblown, manifested vestiges, Hogosha is a new identity that shares both of their memories; all of this culminates in a hero that is just as determined, compassionate and warm hearted as both of her components. OVERHAUL was beaten down and temporarily driven into a colossal mental breakdown.