Cupids, also called Cherubs in the celestial chain or sphere, are ordered as third class angels. Castiel thought that a cupid was the one making people kill each other for love. He appears as a naked man in the series. Their "handshake" is hugging someone very tightly and apparently nobody likes it, as evidenced by Castiel.
They all follow Heaven's orders, particularly serving Michael. In their occupation, they are responsible for manipulating affection in certain, special bloodlines likewise with Dean and Sam.
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Supernaturals guide to hunting
De TodoIt's every monster sam,Dean,Bobbie,and john have seen or hunted. This book tells everything from there abillites to how to kill them