Guest is a ghoul. Ghouls are are physically identical to humans, however, they are roughly 4-7 times stronger than humans, they are able to regenerate much faster than humans, they have an organ called a Kagune which they can release and use as a weapon, and they need to eat humans to survive.

Guest has been sent to U.A. as a transfer student by some of the most powerful and influence ghouls in Japan in order to Integrate ghouls into hero society so that they can fit in better with humans. No one knows Guest is a ghoul and they have been told to pretend to be a normal human and not let anyone find out they're a ghoul. Guest is about to start their first day at U.A. as a part of class 1-A. Guest is outside the door of the classroom, waiting to come in and introduce themselves to the class.