Domo-kun and Nnke-kun

Domo-kun and Nnke-kun are aliens, they are planning to conquer the earth. They are the first joke characters invented by Oda. They first appeared in Oda's short story God's Gift for the Future later Domo-kun makes an appearance in the chapter 9 seen alongside with Buggy pirates. Oda answered in the SBS and draw both of them.