Run a search for the page you want to make, and you'll be prompted to create it. A lot of the names you listed are outside the scope of the wiki though. The ones I'd sign off on (other mods may add more) are the aliens from Monsters, anything from D-War or The Magic Serpent, Demeking, Dinosauria, Godzilla Battle Royale, Gwoemul, Kraa, and Pikadon. Personally, I'd like to cover Queen Kong and Konga on this site, but there's no consensus on them yet.
Amhuluk/Baphomet (if you're talking about the ones from Godzilla: King of the Monsters) are included on the "List of MonsterVerse monsters" page, while we simply link to the Pacific Rim wiki when mentioning characters from those films. Gfantis already has a page.