Blue Exorcist's power system is the Meister classification — nine types of exorcist specialization combined with the unique demonic power system of the Okumura brothers.

The Nine Meister Types

MeisterSpecialty
KnightPhysical weapon combat using demon-enchanted blades
DragoonFirearms — anti-demon bullets and ballistics
AriaScripture recitation — the most versatile offensive type
TamerCommands familiar demons in battle
DoctorHealing and purification

Rin's Satan Flame

Rin's blue demonic flame is the same fire that Satan wields — the most destructive force in Gehenna. When Kurikara is sheathed, the flame is sealed completely. When drawn, it manifests based on Rin's emotional state. Full release destroys everything including Rin's own control.