Oyster Cookie's Envoy (Korean: 오이스터맛 쿠키의 전령, oisuteo-mat kuki-ui jeonryeong), otherwise known as Cookie Union Officer (Korean: 쿠키 왕국 연합 지휘관, kuki wang-gug yeonhab jihwigwan, "Cookie Kingdom Union Commanding Officer"), is an NPC introduced in the first part of The Council of Heroes update (v3.0).
Cookie Union Officer, or Oyster Cookie's Envoy after an assumed promotion
Over a year and a half after their first and previously only Story appearance in Cookie Odyssey, Oyster Cookie's Envoy reappeared in Cookie Run: Kingdom's narrative in Spire of Shadows. They are seen in an illusion in which the world's nations—namely the Crème Republic—distrust Pure Vanilla Cookie; here, Oyster Cookie's Envoy is referred to as Cookie Union Officer[2] and appears to have been promoted based on their Korean title of commanding officer (지휘관, yeonhab). Due to the falsity of the circumstance they are shown in, however, it is unclear whether or not this upgraded appearance is canon.
Oyster Cookie's Envoy appears to be heavily themed after a mussel (family Mytilidae), perhaps indicating a true name of "Mussel Cookie."
Cookie Union Officer's original Korean name (Korean: 쿠키 왕국 연합 지휘관, kuki wang-gug yeonhab jihwigwan) more directly translates into English as Cookie Kingdom Union Commanding Officer.
↑Both Oyster Cookie's Envoy and Cookie Union Officer are internally assigned the character string ID CharacterList.Name.1988164338, confirming that they are the same person.