In demonology, Gaap is a high president and prince of Hell, commanding 60 legions. He is one of the four principal kings. He instills great feelings of love and hatred in humans, as well as stupefying fools and enlightening philosophers. Gaap has some animosity toward Byleth and will not cooperate with those who can also summon him. He has power over familiars, as well as the ability to instantly teleport people across the globe.