male
The Dark Lord of Europe from around 1930-1945, when he was defeated by Albus Dumbledore. In the books, he is described as a young, handsome boy with golden blond hair at 16, and as an old, frail, skeletal man with sunken eyes at the end of his life.
Gellert Grindelwald
Professor Moriarty
for Professor Moriarty in Sherlock Holmes (with Harry Potter characters)
Suggested by tardis24
Guy Ritchie's Sherlock Holmes franchise but with Harry Potter characters. Fantastic Beasts characters are also allowed.