Because you like Duke Nukem in Duke Nukem
Clank is the quintessential rational, intelligent robot sidekick. See them in Ratchet & Clank.
After figuring out how both the light and dark halves of his soul could co-exist, Jak is maturing into a real hero. See them in Jak and Daxter.
A genetic experiment engineered to be the perfect assassin, Agent 47 is cold, professional, and lethal. See them in Hitman.
A great galactic bounty hunter, Samus Aran is not as good at expressing emotions. See them in Metroid.
A no-nonsense pro, Agent K has dedicated his whole life to his job. See them in Men in Black.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.
Intelligent Adele is soft spoken yet brimming with emotion. See them in Blue is the Warmest Color.
Simon Belmont is a vampire hunter bravely carrying on the family business. See them in Castlevania.
Maya Lambert is an obsessive intelligence officer with tunnel vision leading toward Osama bin Laden. See them in Zero Dark Thirty.
Thanos is an intergalactic warlord, on the hunt for infinite power. See them in Marvel Cinematic Universe.