Because you like Luigi in Super Mario Bros.
Prideful and psychotic tendencies combine to make Dr. Eggman a dangerous and villain who will squash anyone in his path. See them in Sonic the Hedgehog.
Michaelangelo is an above-ground crime-fighter by night, and a pizza-eating, sewer-dwelling mutant ninja turtle by day. See them in Teenage Mutant Ninja Turtles.
He might look like a pretty boy, but resourceful Leon Scott Kennedy is the man to have at your side during a crisis. See them in Resident Evil Series.
All who live know his name, and all who oppose him shall know Death. See them in Darksiders Series.
Raiden is an efficient soldier haunted by his repressed past. See them in Metal Gear Series.
Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.
For Wreck It Ralph, it's not easy being the bad guy. Especially when you've been designed to destroy but really desire love. See them in Wreck-It Ralph.
Driven by guilt and rage, Kratos is less a man and more an unstoppable avatar of anger and hate. See them in God of War.
World domination and Superman's demise are next on Lex Luthor's to-do list. See them in DC Extended Universe.
All it takes to change the course of history is the will of a single man called John Price. See them in Call of Duty Series.
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.