Ganondorf: Ganondork, Ganny, evil king of evil
Phantom Ganon: Fanny Ganny, phantom dork
Ruto: Oh-no-not-you-again
Majora: Jora, Majjie
Groose: Goosey Groose
Ghirahim: Lord Debbie the Fabulous, diamond loving lunatic
Midna: Middy
Vaati: Purple haired weirdo
Okay I'm done. I couldn't think of any...