Gray Fullbuster is a member of the Fairy Tail guild. He is an 18-year-old ice mage, practicing ice alchemy, the art of molding ice. Due to his training history, he is most comfortable in little clothing and often forgets to wear clothes or quickly takes it off, thus often being accused of being an exhibitionist. He and Natsu have a friendly rivalry, and can often be seen fighting one another. Lucy believes the nature of his magic is the reason that he and Natsu constantly bicker. His member stamp is on the right side of his chest.
In certain panels, Gray's necklace looks quite similar to the Rave Stone which is a crucial part of another one of Mashima's stories, "Rave Master." Mashima has stated he doesn't remember the name. He takes off his clothes because Ul made him do it as one of her teachings and now it's a force of habit.