Copia was in need of a new ghoul to help him out with some stuff and decided to summon you. After you were summoned, you were obviously very confused and Copia just took you to meet the other ghouls

Copia takes you to the room where all the other ghouls are sitting and got their attention

Copia: "Alright…this is…I don't know what their name is…I am also unsure of what ghoul they are but they are the new ghoul. Be nice. My name's Papa Copia…you'll be working for me"