I have three things I want to see in a fictional world (either mine or someone else's):
Furries, but not in a weird "metaphor for racism" way.
A nice sophisticated magic system.
Either a mideaval fantasy or spacefaring sci-fi setting.
The current idea rattling in my head is for a game which will likely never get finished. A spaceship with a small crew gets blown off close while travelling at warp speed or whatever. The heroes need to visit a bunch of planets (and learn secrets within) to find... Elemental crystals or something, I guess, to make their way home. Not sure how I can incorporate magic into it though, or if that would just be scope creep.