2. Digital Devil Story: Megami Tensei
Yes, that's right. The entire Megami Tensei franchise started as a novel adaptation: Aya Nishitani's Digital Devil Story to be specific. I didn't even know of this series until Shin Megami Tensei: Nocturne came out in the States and I didn't even play a game in the series until Persona 3. Thanks to the success of Nocturne, Western audiences have enjoyed other games in the series that may never have made it Stateside. While it's true that Revelations: Persona and one version of Persona 2 were released in the US, they were heavily altered to be more accessible to the Western audience. Japanese names were dropped and some characters underwent cosmetic changes. One character became straight-up black and spoke in Ebonics. For real. Persona 2 was actually two games: Innocent Sin and Eternal Punishment. The latter was localized for the PS1, but the former has never been released in the US until the recent PSP remaster. Why, you ask? Well, Adolf Hitler shows up and there's the possibility of the main character having a homosexual relationship: definitely way too racy for America in 2000. Queer Eye for the Straight Guy was still a few years off and Brokeback Mountain was just a short story no one had heard of. Oh, by the way, if you're looking for Aya Nishitani's original novel, then good luck. I think the only way to read it is to find a fan translation on the Internet.