Well, I don't have the exact storyline planned out, but I do have certain elements that I would like it to have. First, I want it to have a bit of an innocent feel to it, but still have a degree of seriousness. The problem is trying to find the balance I want, or more specifically, how affected they are going to be at the end of everything. I'm not that serious of a person, so it might be a bit more on the light-hearted side, but I'm still not sure.
Something that I have always liked in video games were interconnecting storylines, so that's something I want in the game/story, which means I'm also going to want multiple protagonists. I'm tempted to not give anyone any "radical" personalities, but I still want them to have some key traits that differentiate themselves from everyone else. As for the setting, I might make it into a fantasy-land place, mainly because I have a tendency to restrict my imagination when basing things on real places, and it will help me a lot more when trying to give my story a light-hearted feeling.