I saw a Keroro meme circulating around tumblr and decided to join in too. :D This is Nobibi and his little alien friend Ketsubakuchiku, they only had an appearance one episode of the anime  but I love his design HE IS SO CUTE. I figure he is based off of Nobi Nobita from Doraemon:
kurusouchou has been kind enough to upload a good portion of the compilation, as well as xshinolovebugx has joined in (to my knowledge). I know there is also at least 1 WIP from someone else.