Well, there are so many that apply. Severus Snape, Potion's Master, Professor, Defense Against the Dark Arts Master, Head Master, Order of the Phoenix, Deatheather, Head of Slytherin, Double Agent, and all round Bad Ass.....LOL

It should be "PotionS Master", as in the books.

All of these titles are fine by me. I expected the "Half-Blood Prince", it's missing in the list. I would add one I made : "Defender of students against evil", when he did his best to avoid them harsh punishment at the hands of the Carrows when he was Headmaster.

There's just something about that title that demand respect :D

I always think Severus was doing his best to protect students.In GoF,he got up in the night just because he heard someone was screaming painfully.In Cos,when he heard a student had
been taken by the monster into the Chamber he gripped the back of a chair very hard and said, ‘How can you be sure?’ He cared for all of the students all along.

I like your comments everyone :D And Lady Nottingham nice title :D...I like it "Defender of students against evil" :)

I can't believe I left The Half Blood Prince out of my list! Accckkk!
And everyone is right. He did what he could to the best that he could.
I read a fanfic once, that had a toast to Severus Snape, it went something like...

"To Severus Snape, whose long journey through the dark has ensured that future generations will live in the light."

I love it.

and the Half - Blood Prince

All of the above but @karenmiller1972 i'm sure you meant all round SEXY bad ass :P