The Ravanged

The world is plagued by alien parasites who devour brains. The Ravanged are individuals like himself who have lost all sentience to the aliens and are, due to being unsaveable, socially acceptable to keep as pets, but only when disconnected from the parasites. This one's still hooked up, his brain slowly rotting. Do you want to save him, or should you leave him to become a spirit's pet in the afterlife? This is a world where Pokémon and Pals are treated as essentially the same type of species.