Kokushibō was the first demon to use Breathing Styles — his signature version, Moon Breathing, is one of the most dangerous ones to ever exist. .As the highest ranking member of the Twelve Kizuki, Kokushibo is an extraordinarily powerful demon, second only to the Demon King Muzan Kibutsuji himself. Kokushibo was a Demon that utilized Breathing Styles. His combat style, in particular, is one of the most dangerous and powerful combat styles displayed thus far. The Moon Breathing combat style.