Today's post is about familiars from the show Blue Exorcist. Familiars are demons that tamer exorcists can summon. The tamer has to use a summoning circle, a drop of their own blood, and a summoning chant in order to summon a familiar. Familiars will do what the exorcist says as long as the exorcist's will power is strong. If the tamer's will power becomes weak, the demon will turn on the tamer and attack them. The only way to stop this is by tearing the paper that the summoning circle is on, or breaking the circle, which causes the familiar to disappear.