In the world of Shrooms,your body will get infected and start mutating according to what you eat, where you live, what attacks you, etc. At the moment we have 6 entire sets of mutations in the game, and while they aren't anywhere near complete, you can already combine any of the four parts (Head, Torso, Arms and Legs) in your character to create your perfect survivor.
moddb.com/news/the-character-mutations-in-shrooms