ALAN RICKMAN
His very distinctive face was perfect for the part of Severus Snape, the apparent villain with a secret heroic heart in all the Harry Potter movies. Alan Rickman left us prematurely at 69. He had an interesting film career beyond the Potter epics.
In the original Die Hard (1988) Rickman is the arch-villain Hans Gruber. He is head of an evil group of criminals who pull off a daring heist. This film launched Bruce Willis’ career as an action star. 
You can’t get much more evil than Alan Rickman’s character (Elliott Marston) in Quigley Down Under (1990). Tom Selleck plays Quigley, a noted sharpshooter who is hired by Marston for his long-range shooting ability. He thinks he is to kill dingoes. Turns out he is supposed to kill Aborigines. He refuses and is beaten and taken to the middle of the outback to die. He is rescued by- guess who- Aborigines! And from there it gets even more interesting. 
Alan Rickman is the lead character in the very strange Truly, Madly, Deeply (1990). He plays Jamie, a dead cellist. His bereft girlfriend (Juliet Stevenson) is visited by Jamie’s ghost. At least we think so. At first she is enchanted, but when he starts turning up the heat to 90 and moving furniture, not so much. There is a surprise ending you won’t find here.
In the also strange mocumentary Bob Roberts (1992) Tim Robbins plays a right-wing folksinger running for the Senate. His campaign is a laundry list of sleazy tactics, and his campaign manager, Lukas Hart III, is portrayed by Alan Rickman. You just may recognize some of the people and some of the tricks they pull. The film is now almost too close to the truth to be a satire...
Michael Collins (1996) is loosely based on a character from the Irish rebellion of 1916. The title character is played by Liam Neeson. Alan Rickman plays Eamon De Valera, who is on the opposite side of the revolt from Collins, but who later became Irish Prime Minister. Rickman’s character definitely does not play nice...
Alan Rickman actually gets to play a good guy in Jane Austen’s Sense And Sensibility (1999). He is Colonel Brandon, suitor of the Dashwood family’s younger daughter, Marianne (Kate Winslet). She originally rejects him because of his age, but later in the story she gradually changes her mind as his good qualities appear. Emma Thompson wrote the screenplay and portrays the elder sister, Elinor. She is Sense to Marianne’s sensibility. 
Johnny Depp is Sweeney Todd (2007) the murderous barber of Fleet Street. Alan Rickman is the notorious Judge Turpin, whose questionable sentencing of Todd pushed him into his career as a throat-cutting barber. At first, Swenney misses a chance to dispose of Turpin. He then proceeds to butcher a large part of London’s male population, who are then ground up into meat pies by Mrs. Lovett (Helena Bonham Carter). Todd gets another chance at his nemesis and doesn’t miss this time. Folks, this is a musical!
Alan Rickman as Ronald Reagan seems something of a stretch, yet that is his role in The Butler (2013). Forest Whittaker plays the title character, who serves many presidents as head of the White House domestic staff. The Reagan character is both celebrated and criticized as the plot develops. 
All of the movies in this article are available on DVD and for streaming. All are for mature audiences.