I would like to make two games. I want a franchise similar to Zelda that runs the span of one individual's life. Similar, graphically and in mechanics to Ocarina, Majora, or Starfox adventurves, it would detail some peasant boy on the outskirts of England. His village is destroyed by unusual invaders and some members of his family are killed. Doorway opens up into a Fairie realm. Now, as a young person he can only use so many weapons and tools, maybe ride wild boars instead of horses. I dunno. But he has to seal the doorway so the invaders can't come back into the "real world". Of course, he becomes trapped in the other realm and subsequent games would have him age and gain new abilities, on his way to becoming a great hero/warrior in the realm.
Also, I would like to make a G.I. Joe game based on Snake-Eyes. Ninjas are cool. Huge levels that are basically a few cities, a jungle, the arctic, desert, and some fortresses. In 3D third person, he would be able to use just about any weapons in the game, since he is an expert with weapons asides from being a ninja. Yet the simple sword and ninjitsu are what he prefers.
Purpose of the game? To save Storm Shadow. He is held in a fortress in the Bayou by the dreadnaughts. Course there are side missions, but that is the main one. Once you complete the game, you can play as Storm Shadow, who has different abilities and can go some places Snake Eyes can't (and vice versa) making the game a little more difficult.
THEN, beat the game with him, and you unlock Zartan. Always keeping it interesting. If you want to know the connection between these 3, read Larry Hama's work.