I suggest you take a loot at the 85 page thread for Puzzle & Dragons. Other than that, I enjoyed Knights of Pen and Paper for as long as it lasted, and Super Hexagon is always a good time killer.
If it is specifically action RPG's you're after, you'll find plenty of generic ones for Android. Most of them will want to you to use in app purchases, and even more of them will be mediocre compared to what you would find on a real gaming device. I haven't found a single one so far that I've enjoyed for more than an hour.