Game Story Development: Brainstorm Summary

In my brainstorm, I think I covered the important elements which would contribute to any game. I focused on the characters and their alter egos (who they turn into when the curse is put on them), the location, one of the scenes (interior of castle) and also the exterior. I also used a drawn map which shows an aerial view of the castle so my players knew where they would have to go to collect certain things or progress in the game. I think I could have maybe focused more on the characters for my game and what the would look like as after researching games of the same genre and seeing how their characters look, I feel mine do not live up to what is expected and wouldn't be as conventional as another game's characters.