The most common photosynthesizing bodies are plants (including corals), phytoplankton, fairies and such. Most Awaken photosynthesis uses a pigment known as chlorophyll to induce it, while Dreamy photosynthesis usually relies on Xenophyll. A simplified version is as follows:
Ashgas + Water + light + Chlorophyll -> Oxygen + Sugar + Chlorophyll
Organisms called phototrophes relie on photosynthesis and light to feed themselves.