Treesa is a Nomshark (Go to felis to see what those are X3) shadow goo. Her master is Noika who you might have seen before in my gallery as the shadow leafeon espeon hybrid. Short back story

She was once a female human botanist but after a slight impromptu consumption, after starting to explore a new shadow grove, she was transformed into Noika's servant, now a very VERY happy herm nomshark. She serves her master well now after her transformation, loving it and taking care of the shadow grove and her master. She is quite happy as she now feels more like the plants themselves. She hopes someday that the grove will consume the forest in darkness for her and her master.

Anyways
Art and nomshark are by  Fweeblies
Treesa is mine~
Noika is mine too