19. Jurassic Yoshi
Real life couldn't have created an enemy more terrifying than your standard police officer; after all, what other civil servant has the state-sanctioned power to murder us, both with military-grade weaponry and egregious parking fines? True, most of your garden variety cops spend their shifts hassling non-violent drug offenders and telling rude teens to stop skateboarding on things, but a small minority employs the power of the badge to abuse their authority with criminal intent. Thankfully, the medium of video games allows us to seek vengeance against those who've fallen over to the icky side of the thin blue line a more gratifying fate than seeing the traditional crooked cop punishment of extended paid vacation.
(WARNING: Some pretty significant spoilers lie within)
Since 1994's Pulp Fiction, the casting of Samuel L. Jackson in any role serves as a sort of shorthand for the audience, as if to say "this expletive-shouting man may be dangerous and unstable." If he's on the protagonist's side, then victory's in the bag, and the creative vulgarities can fly freely without caution; unfortunately, the first five minutes Grand Theft Auto: San Andreas spell out the fact that Officer Frank Tenpenny is a very, very bad man. His behind-the-scenes string-pulling gives our hero CJ the mass-murderer status demanded by every Grand Theft Auto installment to date, and Tenpenny's own crimes eventually lead to a full-scale riot the aging hardware of the PlayStation 2 did its best to simulate. Close to ten years later, and Grand Theft Auto as a whole has yet to come up with a more enigmatic villain or at least one voiced by a guy with some clearly defined snake boundaries.
This ancient and noble house has existed for almost 20 years but of late, they've become aggressive and warlike towards the other houses, their egos boosted by their superior stores of knowledge and spoilers. After years of solitude, quietly reading books, they have emerged to exert dominance over non-readers. When not complaining about how "Yara" is actually named "Asha" or how Tyrion's scar is all wrong, they keep subtly trying to spoil events that won't happen for another 4 seasons right now they're giggling about some wedding that involves the color red, but assure their enemies that "oh, don't worry, that's technically not a spoiler."
Historical Note: Younger members of this house were involved in the Potter siege of the Rowling highlands, which lasted nearly a decade.