HAL 9000-(2001 book and movie) HAL starts as a the helpful ship AI who wishes only to reach Jupiter(Saturn in the book) but through a sort of glitch, he becomes slightly unhinged. He finds out that the crewmembers want to shut him down. He tries to stop them at all costs, because he sees them as an obstacle to the mission. All the while, his calm, monotone voice perserveres. It is intensely creepy.
Roy Bat(t)y-(Blade Runner/ Do Androids Dream of Electric Sheep) Really and anti-hero and a true hero at the end of the movie(I haven't finished the book yet), Roy Batty is really just a person who wants nothing more but to live, to live freely. That's what we all want, isn't it?
Darth Bane-(Star Wars) Darth Bane is so wickedly intelligent and reserved and yet he really is evil and has little regard for life. He cares less about himself and more about keeping the Sith tradition alive. He is very wise, but in an evil way. For that, I've really liked this villain since I wa first introduced to him nearly ten years ago in the Jedi Vs. Sith comic.
SHODAN-(System Shock) Similar to HAL.
Darth Nihilus-(Star Wars KOTOR 2) Self-explanatory if you know who he is.
Darth Vader-(Star Wars) If you don't know about him, go jump off of a cliff.
This next one is rather obscure and complex as his life is painted over multiple books, but he is arguably my favorite. I want to explain it a bit more in detail. There aren't any major spoilers.
RuGaard, Tyr of the Underdome(The Age of Fire/ AKA one of the most underrated fantasy series of all time): RuGaard is a lame dragon he is blind in one eye, has a shattered wing, a broken foreleg, and a fire bladder that barely works. He is also the ambitious leader of the final bastion of Dragonkind, The Underdome. He wasn't born this way. He definitely wasn't born into power or into the royal family. He was born to two unimportant dragons somewhere high up into the mountains. Each and every male dragon is forced to fight their siblings to the death when they hatch. He lost to his brother and was disowned out of pity rather than killed. His parents never even named him, so he had no identity originally. His hate for what his parents and his brother did to him eventually led to him lead an assassination attempt on his family with a bunch of dwarves. They killed the parents and one of the daughters, but his sister Wistala and brother AuRon escaped. The dwarves then betrayed him. Wracked with guilt, he attempted to throw himself into a chasm thus commiting suicide. He failed and wound up in a vast network of tunnels underground called the Underworld. Wandering for weeks, he wound up at the Underdome and by circumstances not entirely under his control, he wound up being adopted into the royal family and christened RuGaard after the leading Dragon's(the title is Tyr) deceased uncle. However, the narrator never refers to RuGaard by that name but instead calls him "The Copper" after his scale color, thus implying that RuGaard still believes that he doesn't have a true identity. Eventually, RuGaard became Tyr, and led a war against the hominids who had long persecuted his kind.
The reason why I like RuGaard is because he really isn't bad. But life experience leads him to do morally questionable things throughout his life. The series covers much of his life and that of his orphaned siblings. He's the most interesting because of how he evolves over time from an innocent drake who wants to be accepted to sort of Fuhrer who wants to purify the world so that everyone can live in peace. He does this violently, however.
