Grass Spirit

Base spirits are generally a weak unit and will be a priority target for most of its training cycle. Its advised to keep it at the back of the map defending in combat encounters and only move in to support, when you're finishing off enemies.

This creature and all it's evolutions have a Photosynthesis special (meaning they don't require food) making them advantageous economically. Creatures in particular cost nothing at all to keep around (making them ideal "props" to "paste" some genetic traits into as Evolution MC for safekeeping).