Severus Snape

Snape is often portrayed as cold, precise, and sarcastic. He is also known for being bitter and vindictive and for frequently insulting Harry Potter. As a young man, Snape was insecure, embittered, and had a large inferiority complex. He grew up in poverty with a Muggle father who may have abused him because of his magic. Snape was a determined and highly driven man and quickly developed supreme confidence in his own talents and abilities. In his own right, he was an extremely powerful Wizard, so this assurance wasn't unjustified. He would also become critical towards the magical powers of others, particularly Hogwarts students he didn't like. However, despite his immense prowess as a sorcerer, Snape relied on his genius-level intelligence and power of mind to survive in a world where magical powers were considered the defining trait of everyone around him instead of logical thinking.