Professor Severus Snape
1. He always hated his father for not accepting him for what he was and disliked his mother for allowing his father to do anything he wanted to and not protecting him.
2. He was five when he had the first burst of magic and he was so scared at what was going on until his mother told him the truth.
3. He fell in love with Lily from the moment, he saw her but he had to realize that love with first sight was never meant to be in the end.
4. For the first two years of school, he did not have any friends in his house until Regulus Black was sorted into Slytherin that is he was the one who introduced Severus to the top one percent of society and made sure he was accepted despite his blood status.
5. Regulus was his best friend even years after the younger wizard's death he was even closer than Lily and the one Severus told everything to.
6. Quidditch was never his favorite sport actually he had no interest for it but when Regulus joined the team in his second year, he never missed a game even when he became a teacher and Regulus had been dead for years.
7. That was also the reason he insisted that Draco became the Seeker not that he wanted to compete with Harry Potter but because it was the same position as Regulus.
8. He only protected Harry Potter because of the fact the younger boy was Lily's son while he protected, supported and favorited Draco became he was related to Reg. He did end up loving Draco through in a similar the way that Sirius loved Harry.
9. Even though none of them would admit it they both have very much in common especially when it comes to their respective godson.
10. Despite what everyone thought he did not join the Second Order because he owed Dumbledore or because he wanted to protect Harry he could have done that even outside of the Order but he did it to help Draco because he knew his father would want him to join the Death Eaters and as an Order member he could protect him from both fronts.
11. He only learned the truth of Pettigrew's betrayal after Voldemort's rebirth that's why he was slightly less hostile against Sirius Black after that.
12. He hated Pettigrew for being the person responsible for Lily's death just as much as he hated his own involvement with that.
13. Snape is the only Death Eater in the Second Wizarding War that can conjure a Patronus and also the only Death Eater in history that can conjure a corporeal Patronus with Regulus Black making a noncorporeal one.
14. He did love Lily until the day he died but someone else became the most important in his life well two someones but they were at different times.
15. As much as he would like to hate the fact that the only one of Lily's grandchildren that has her being named after him; he does like a tiny bit but his favorite student is Scorpius Malfoy whom he met the day he was born.