We have two-star panda, a three-star panda, and a four-star panda. Panda bears everywhere.
We also have a pair of those humanoid monkeys from Chinese mythology, one is the infamous Wu Kong, and the other looks like a two-star cousin of his.
I was thinking that maybe you could create a new quest where you were sent to a monastery, hidden deep in a bamboo forest, to receive some holy training. And the opponents you spar against are these pandas and monkey-like creatures.
-I was also thinking that maybe you could create a new form of token-coins, that could be spent whenever holy heroes are on specialty. These would be your reward for completing this quest.-
P.S. as there is only one four star panda and one four-star monkey, I was thinking that you should throw in the costume versions to add variety to the opponents you will face.
EDIT: scratch the tokens part of the idea. Instead, the reward I suggest are simply yellow trainer Heroes.