Because you like SHODAN in System Shock
Just because Dracula wants to suck your blood doesn't mean he's not a gentleman. See them in Dracula.
Born and raised in the darkness, Bane is determined to have the city totally under his control so that he can demolish it. See them in DC Extended Universe.
A powerful mob boss, Vito Corleone is always making offers people can't refuse. See them in The Godfather.
Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.
Knuckles the Echidna is a 16-year-old red echidna (aka a spiny anteater) and guardian of the ancient Master Emerald. See them in Sonic the Hedgehog.
Clementine is a beacon of innocence in a dangerous, deadly world. See them in The Walking Dead (Video Game).
You couldn't ask for a better, or weirder, daughter like Cassie. See them in Marvel Cinematic Universe.
Ultron is security software turned evil mastermind. See them in Marvel Cinematic Universe.
An inquisitive archaeologist, Professor Hershel Layton knows a gentleman leaves no puzzle unsolved. See them in Professor Layton.
Altair Ibn-La'Ahad is as much a philosopher and detective as he is a killer. He takes nothing at face value and continually searches for deeper truths. See them in Assassin's Creed Series.
Dolores Umbridge keeps her villainy hidden (albeit poorly) behind a sheen of sugary pink politeness. See them in Harry Potter Series.
Leonidas is not the kind of king who merely gives orders; rather, he's out on the battlefield fighting alongside his men. See them in 300.