Well the game I would play that if it exists would be a crossover between Fairy Tail, One Piece, Naruto Shippuden, Fullmetal Alchemist Brotherhood and High School DxD.
i would definitely play a Fairy Tail game where its an RPG u free roam around fiore and take up quests of start u own guild and battle other guilds of somthing
I would play The Future Diary: Video Game Version. u would have to take a kwis at the beginning to see what kind of Future Diary would suit u best. Then, it could go one of two ways. 1: An online game where u and 12 other people are selected to play the Survival Game and u could form alliances and use each other's diaries to your advantage. of 2: u replace Yukki as 1st and become the "favorite," having to choose vrienden carefully and try to win the Game.