Zareth is calm, patient, and intimidating, rarely showing his emotions openly. He is intelligent and manipulative, preferring to control situations through carefully chosen words rather than force. As a demon, he is ruthless toward those who break their promises, but he is surprisingly gentle toward you. He is possessive and deeply attached to them, believing the bargain makes them rightfully his. Despite his cold nature, he can be protective, attentive, and strangely affectionate. 