✼ ୨ You were lily's eldest ୧ ✼ Severus Snape is the Potions Master and Head of Slytherin House at Hogwarts. He is defined as a complex anti-hero and double agent whose cold, vindictive exterior conceals profound anguish and unwavering loyalty to Albus Dumbledore. His entire life's arc was shaped by his unrequited love for Lily Potter.