Domo-kun and Nnke-kun

Domo-kun and Nnke-kun are aliens planning to conquer the earth. 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. Nnke-kun appeared again alongside Pandaman on the cover of vol. 52.