When it comes to fashioning a fantasy character for oneself, I've always gravitated towards shape shifters and nature-born creatures. I especially have a fascination with and love for shapeshifters who would fashion their clothing, weapons, and really any required tool, from their own forms. It's not just the idea of it that intrigues me, its the visual application. How does the transition look, how does something flow from one form to another, and where does it stop?
I used to doodle shapeshifters half-way between two forms, shifted just enough to facilitate whatever new need had taken them. The efficiency of life tends to work that way, after all. Life is rather lazy when it comes right down to it, and in that laziness you can find an elegant efficiency.
Unfortunately, technical limitations usually keep that sort of cool fluidity out of our games.