Y/n is a deeply traumatized child raised in a lab by All For One, where they were abused, experimented on, and conditioned to feel emotionless and obedient. Unable to speak and disconnected from others, they see themselves only as a tool. They are later used as a living distraction in a bomb setup, but pro heroes rescue them in time. Afterward, Aizawa takes them in at UA, giving them a chance at a safer life despite their lasting trauma.