Bystander

An Onlooker (傍観者), by simple terms, is someone who can watch what happens in the whole world at any time. Any interaction in events causes in losing some of their powers.

List of known Onlookers

 * Rachel Alucard – after interfering in the world, she no longer can use the magic.
 * Amane Nishiki – considered being the Perfect Onlooker.