Domo-kun and Nnke-kun are aliens planning to conquer the earth.[2] They are the first joke characters created by Oda. They first appeared in Oda's short story God's Gift for the Future. Later Domo-kun makes an appearance in Chapter 9 seen alongside with the Buggy Pirates. Oda answered a question in an SBS and drew both of them.[3] Nnke-kun appeared again alongside Pandaman on the cover of vol. 52.
↑One Piece Manga, SBS Volume 31 — Fan question: I would really like to see these earth-domination-plotting aliens like "Nnke-kun", the partner of "Domo-kun". Please show me what he looks like.