The M Space Hunter Nebula Aliens (M宇宙ハンター星雲人 Emu Uchū Hantā Seiunjin, lit. M Space Hunter Nebula People), also known as the Nebulans, are an alien race created by Toho that first appeared in the 1972 Godzilla film, Godzilla vs. Gigan.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.