Percii is a kwami that is connected to the Gryphon Miraculous, which April Pritchett currently owns to become Gryph.
Percii is able to fly and levitate like all Kwamiis. He later shows that he can pass through objects like doors. As a kwami, Percii transforms her into Gryph with the Gryphon Miraculous. However if April uses Roar of the Skies, Percii begins to become weak, eventually reverting back to his physical form and changing Aprol back to normal. To transform her again, she must refuel by eating bacon.