Domo-kun is a character that Oda conceived of while still in high school. He's an alien plotting to overthrow Earth with his friend and fellow alien, Nnkay-kun. Domo-kun made his first appearance alongside Nnkay-kun in 'God's Present of the Future' included in Oda's collection of shorts, WANTED! In the short story there is a UFO that crashes before the pair show up and it's possible Domo-kun and Nnkay-kun were riding in it. Incidentally, the UFO that Nnkay-kun can be seen riding on the hidden back covers of Volumes 53 and 54 is extremely similar to the UFO seen in the above mentioned short. Domo-kun first appeared early on in the actual comic in Volume 2 Chapter 9 page 13 and received a profile in the data book BLUE which was further expanded upon in the SBS from Volume 31 Chapter 293.

Domo-kun's friend and fellow alien working with him towards conquering Earth. Nnkay-kun was first mentioned in the data book BLUE in Domo-kun's profile but was not seen in One Piece until the SBS from Volume 31 Chapter 293. Similar to Pandaman, there doesn't seem to be much consistancy applied to Nnkay-kun's design. While on the hidden cover of Volume 52 he appears to be roughly the size of Pandaman's head, on the hidden back cover of Volume 53 he appears to be significantly larger.

Pandawomanmi