Horace Slughorn (b. 28 April, between 1882 and 1913) is a fictional character in J.K Rowling's Harry Potter Series. He attended Hogwarts School of Witchcraft and Wizardry as a member of Slytherin before returning in 1931 as Potions Master.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...