Gray Fullbuster (グレイ Gurei) is a member of the Fairy Tail guild, and is often accused of being an exhibitionist. He's eighteen. While he doesn't seem to enjoy showing off his body, he does tend to lose or forget his clothes quite often. He and Natsu have a friendly rivalry, and can often be seen fighting one another. He practices ice alchemy, and Lucy suggests that this is the reason that he and Natsu don't get along. His member stamp is underneath his collarbone.
During the Lullaby of Death events, he fights and defeats, with his ice magic, Rayure, one of the Eisenwald Guild. After Natsu defeats Shinigami Eligor, and the evil spirit from the Lullaby of Death is awakened, he fights along side with Natsu and Erza. Together they win against the spirit.
After Natsu, Happy and Lucy run off with an S-Class mission, Gray is sent by the Master to retrieve them. He finds them, and engages Natsu in a fight in order to defeat him and bring him back to the guild house, however, the battle is interrupted by a fisherman who asks them if they are there to destroy the curse, and invites them in his boat.
Despite not wanting to follow, as his purpose was to bring Natsu, Happy, and Lucy back, he is rendered unconscious by Natsu and dragged on with them to the S-Class mission. On the island, he agrees to join them on the mission because as he puts it, "It'd irritate me if you guys get to the second floor first. And if you guys get expelled, then that'd be boring.
On the island, some of Gray's past is revealed. The person who taught him his magic was a woman named Ur, who supposedly gave her life in order to seal the demon called Deliora. Another of Ur's students has also shown himself, Reitei Leon, who says that it was Gray who killed Ur, although Gray stated that she's still alive. Ur made Leon and Gray train in very cold conditions in nothing but his underwear, which is where Gray picked up his unusual habit of undressing in public without even realizing it. Gray attempts to use Iced Shell twice, on Leon, then Deliora, but was stopped twice by Natsu. He and everyone else found out that although Deliora was revived, he was long dead. He says that Ur lives on now as water in the ocean.
In recent chapters, he is seen restraining Natsu when Erza uses her Herculean armor to protect the guild, and afterwards brings her to safety. Later on, he is seen helping Natsu by freezing Totomaru's arm, and is accompanied by Elfman.
Soon later, he finds one of the Elemental Four, Jubia the woman of the Rain. Engaging into battle with an awkward beginning of Jubia quickly retreating after immediately blushing at the sight of Gray. However, she turns back and immediately engulfs him in her water after making a decision that she must make Gray hers. She immediately panics as Gray's wounds opens, and the battle drags on with Gray clearly having the upper hand. This is however changed when Jubia had a misunderstanding with Gray claiming that he will not hand Lucy over even if it costs him his life. Lucy now Jubia's rival in love, she begins attacking with boiling hot water.
After several attempts, it seems as though his ice is useless against Jubia's steaming hot water. Though he was then successful, he immediately let Jubia out of the ice once he realized the awkward position they were in. Jubia is once again angered when Gray states that the rain is depressing, reminding Jubia of similar comments in her past. The battle continues, with Gray finishing off with Ice Geyser. Not only does Ice Geyser freeze the volume of boiling water as well as Jubia, he also freezes and stops the rain.
As the ice shatters and Jubia lies on the ground, it is for the first time that she witnesses the clear sky. Gray asks if she wishes to continue the fight, though she only faints out of happiness. Not long later, Mirajane and Elfman find him.