SHINING_SUNSHINE is one of the most important members of The Wanderers Of The Field group. He acts like the Sun and the father of all members.
While Albert and the Forest_Overseer are talking underground, Shining appears floating at the entrance, near the Actual sun. He says "greetings my children" and Forest_Overseer forces Draining_Sunflower to go away, since he bothers the Sun, even through the sunflower praised him. then they move on to the rest of the underground and the sun never appears again.