Who is The God of Evolution from The Last Continent: A Discworld Novel and what is their importance?

The God of Evolution is the deity responsible for creating and inhabiting Mono Island, the tropical paradise on which senior faculty members from Unseen University (UU) step into a different dimension of time, the God of Evolution is utterly ignorant of sexual reproduction. Instead he creates one-of-a-kind examples of plants and animals. These mutate at high speed to fill various environmental niches. When he creates a plant that produces filtered cigarettes, the wizards begin to ask questions. He is one of the few deities that encourages questioning. He hates superstition and prejudice and admires freethinkers. His goal is to make creatures that can change their own instructions as needed. He agrees that Evolution is a good term for this, but laments that the plants are all quite willful.