Medphyll
Medphyll is a member of the galaxy-spanning police force called the Green Lantern Corps. A plant-based life form, Medphyll is a veteran member of the Corps, and has served proudly through such events as the original Crisis and the Sinestro Corps War. Medphyll is notable not because of his actions, but because he's got a tree growing from his head. Look at that thing! That thing makes me stand out, even in a crowd of alien cops!