‘Dirty Dom’ Dominik Mysterio, since his WWE debut, has slowly proved himself to be one of the most reliable superstars of his generation who can take charge and headline PLEs. There is a noticeable difference between how important Dominik feels in WWE and how important he has been presented in AAA. (Courtesy: WWE.com)Dominik Mysterio currently stands as the top star of Lucha Libre AAA and is the reigning AAA Mega Champion. Is Dominik Mysterio a champion in AAA? Yes, Dominik Mysterio is currently the AAA Mega Champion in WWE’s sister promotion.