I am looking at making a Groot-like character, basically a plant person with most of the same abilities and traits because holy heck does that guy have some serious power.
Now I know of the Ghoran, but while it is a very close match, it is not exactly a match in some of the important ways.
So while browsing the unofficial SRD I found this third party Moss Lich from Green Ronin which has at least somewhat of a good rep for a Third Party Publisher.
Moss Lich CR +2
Now many of its abilities are directly related to Groot's abilities from the movie/comics. Save for the fluff of them becoming more wild and feral each time it regrows.
Now I was thinking of just using a Human Base with the Moss Lich template applied to it, because the game I wanted to use this at is a level 5 came so the CR of 2 does hurt but is not crippling, three levels of a class is still good.
I was thinking an Oracle with the Wood Mystery and maybe the Lame Curse. I think this fits the style of character, though it doesn't seem to rely on its naturally grown plant parts often mostly spells but that can be handwaved as him doing cool things with his plant powers.