Treetop is proving a tricky one, but Plant and Animal are definite.
I am leaning towards a vision / ranged domain.
We are building the Community / Family one, so I don't know if that will make sense for him.
With the Ranged / Vision feat, I don't know if Martial / Combat will be needed.
Zunder, as the ranking cleric of Treetop, look at the master list and see if there are others you think work.