Combining two of my favorite Earth-conquering invaders from beyond the stars: Keroro of the great manga/anime, Sergeant Frog fame, and the great Cthulhu of the mythos of H.P. Lovecraft, I give you Sergeant Cthulhu!
When he's not busy sleeping beneath Rl'yeh, Sgt. Cthulhu likes to spend his time building Gundam models, watching Pekoponian TV, and infecting the world with his psychic bombardments of insanity! Ia! Ia! Sgt Cthulhu fhtagn!
*Last sale date 2/10/13*
Also available in a katakana/kanji version for a more Japanese look: