I figured I may as well post this, since it would be good to get it out on "paper". Basically, I plan to use this as a writing block and thought bouncer for the world of my Fursona, Kenku Aka William Swiftfoot.
Here's the basic ideas of it I have right now:
High transformation, although limited by spell/scientific skill. So while you might see alot of form shifters, most will be of the more average creature or hybrid, with the more mythical and powerful creatures being found here and there, and many the case such creatures being originally that way. Most if not all TFs are also reversible, although how to do some may take some work depending on strength of spell, will of victim, and materials at hand.
No completely Inanimate TFs. Its just too hard to hand wave such TFs, and while I think I could get away with "Body that functions like a car", any further than that just is hard to explain.
Mid-High Magic. A good fantasy players foray when it comes to spells, but there are no grand rituals that would allow a person to reshape reality to their wishes. Time spells are also very limited to short term alterations(don't really want to try to deal with paradoxes, not to mention they can be such a realm changer).
Modern theme with fantasy styling. Present day makes the most sense for the character, even if his outfit is a little out of place. Magic has affected civilization and thus helps with the comforts of daily life although.
While transformations are prevalent, a person always has a "Signature" form. This is the form to which he will always come back to some time or another, even if this form is not seen in public much. This is also the form that he/she will return to if there comes such a time in which they must revert a transformation, especially baleful ones set on them by another. This doesn't mean a person couldn't quickly shift forms again to hid such forms, but there is always that go between.
This "Signature" form can also change, a person's mind, body, and soul can only take such changes 2-3 times in their life at most, and doing so requires very powerful spells to do so.
I haven't really thought far more than that right now. I do have the a couple places that have in a way popped up in stories and RPs(Kenku's house, lab, store, and stand, The CF Clubhouse, A park for transformation competitions), and Ive thought about governmental ideas, but thats the main things.
So...yea, thats what I have for the moment.