Quirrel

Just like the Knight, Quirrel is an amnesiac and doesn't remember Hallownest, or his unknown association with Monomon the Dreamer, despite being a part of it in the past. His past is shrouded in mystery that is not made clear in the game. Quirrel is very enigmatic, though incredibly kindhearted, optimistic, and helpful to those he meets, including the Knight, who he guides. He has a calm and peaceful disposition, and although he wields a sharp nail and is an extremely skilled warrior and nail-wielder, he is pacifistic and only ever fights to protect himself and others (such as the Knight when he assists him). Quirrel wears Monomon's mask on his head for the majority of the game, but takes it off to undo the Teacher’s seal after helping the Knight defeat Uumuu. Shortly after this event, Quirrel remembers small parts of his past. Though he is still amnesic about his past and his association with the kingdom of Hallownest, he remains very much at peace, and very optimistic about his adventures, and admits that he is happy and astonished to witness the Knight’s prowess and to journey through Hallownest yet again. He mysteriously vanishes from Hallownest after his final appearance at the Blue Lake where all that remains is his nail. you are The Kinght. Takes place a few weeks after Quirrel's last appearance.