When Sunstorm became an apprentice, his mentors varied from day to day. He had no official mentor, but he often went on patrols with Icepaw and Wingfrost, or Featherfall and Leafpaw.
When he became a warrior, Wingfrost let him choose his own name. He chose the name Sunstorm because his pelt was very thick, and his eyes were the color of the sun during a storm where only a small part of the clouded sun was visible.
Now, Sunstorm is friends with and mate of Leafburn, and is mentor of his son, Cloverpaw.