Hmm... Free ones? There are a lot, but I usually stay away from them as I usually end up disappointed. The Zenonia series seems quite popular with people, however, and it's free (I think).
Here's a list of the RPGs I have on my iPad/iPhone:
Ash
Ash 2
FF Tactics
FF Dimensions
FF1
FF2
FF3
Bastion
Chaos Rings
Infinity Blade
Sword and Sorcery
The World Ends with You
Sadly... None of those were free
![Sad :(](./images/smilies/icon_e_sad.gif)
My best advice is to check sites like Appzapp.us or Appshopper daily and wait for things to go on sale or become free. You missed HUGE sales over the X-mas holidays, but they will come again if you are patient.