The Shapeshifting Creature / Life Avatar which is frequently referred to by fans as "Lifealope" because the animal brings plant life back to the wasteland and also has horns similar to that of a mythical animal called the jackalope. It is the main character in the Spin-Off/Tie-In of Romantically Apocalyptic that's currently released every saturday.
It was originally an Avatar of the Biomass 117 (aka Cancer) and grew from the same viral spores.
The spore that grew into Life Avatar was damaged from the radioactive waste and semi-active pathogen fallout present on Earth after the war that exterminated 99% of human life on the planet.
Because it's DNA memory was altered, the Life Avatar did not seek to connect with the Biomass or to execute the Captain.
The Life Avatar has shown the ability to terraform an area alone by it's presence (whether the plants are radioactive mutations or normal grass is unknown so far).
The creature has the ability to shapeshift into any animal form it desires. It has shown that where ever it walks, it terraforms the area back into grassy areas. It is known that Cancer can kill its terraforming.
It shows signs of immortality/regeneration/shedding because after a satellite weapons platform (Owned by ANNET) destroys both Cancer and Lifealope, Lifealope cracks through a corpse of a bull or reindeer (also speculated to be Cancer's body) as if it was an egg and appear in a blossom of a flower that came out of the corpse.
Life Avatar has displayed the ability to resurrect the dead, as it revived both Snippy and Pilot after they were absorbed by Cancer and subsequently expelled when it was blasted with ANNET's Orbital Cannon. It has also shown the ability to temporarily resurrect the long dead, as it revived a pair of skeletons, allowing them to share a brief dance before falling apart and dying again.
Lifealopes revival and shapeshifting abilities seem not to be limited to organic lifeforms, as it reactivated a giant, broken robot of the G-Directorate and now controls it from the inside. The Liferobot shows the same terraforming abilities as the Lifealope and has grown a pair of trees as horns on his head.