Necropolitan Human Ranger 1/Scout 4/Ranger 14.
Important ACFs: Urban Companion (1/2 CL Familiar, lose Animal Companion, gained 4th? level.)
Important feats: Lurking Familiar, Bonded Familiar, Airy Gallop, Swift Hunter.
Important skills: Max out ride ranks.
Now, ask your DM nicely if your Familiar can have flaws. If it can, those extra feats have to be Mounted Combat and Saddleborn.
Buy your familiar a little exotic saddle; I suggest just getting an Exotic Riding Saddle (30 gp).
Now, let your familiar get on your back. You get the following abilities:
-Your familiar has cover. This makes 'em hard to hit.
-Your familiar can take a hit for you. Thanks to Urban Companion not costing XP for your familiar dying, you don't need to really care about your rider overmuch.
-Your rider may replace a Reflex Save or your AC 1/round each.
-You can run on air, as long as your familiar keeps up with the ride checks.
-Swift Hunter goodies.
So, thoughts?