Gray's most prominent feature is his spiky black-colored hair. He has dark blue eyes, and his body is toned and very muscular.
After the Galuna Island mission, he gets a scar on his forehead above his left eye that is only partially covered by his hair. His member stamp is below his collarbone on his right pectoral muscle and dark blue in color.
Unlike almost all other characters, Gray does not consistently wear the same type of clothes (that is, when he is wearing some), though he is often shown wearing some kind of white coat.
Still, his most consistent piece of clothing is his necklace, which looks like a sword with a stone in it (this is similar to the Rave Stone in Rave Master), and a metal bracelet and similar chain attached to his pants.
Gray has a laid-back personality, but he will often get serious when the time calls for it. He and Natsu have a friendly rivalry, and while they can often be seen fighting one another verbally or physically,they are actually concerned about each other. Gray was quite obstinate and reckless when he was younger. Over time, he has attained a more cautious attitude towards life, and deals with problems carefully. He is really concerned about his comrades and is truly loyal towards the guild, but tends to trash talk every now and then. Also, he has a disturbing habit of unconsciously removing his clothes at inappropriate moments. Gray is rather oblivious when it comes to others feelings concerning him, such as Juvia's love for him. However, he has shown modesty around women, such as when Gray (unintentionally) grabbed Juvia's breast, Gray was shocked and visibly flustered and apologized greatly.
Gray was from a village up in the North, but the entire village was destroyed by the demon Deliora. Gray's parents were killed in the incident as well. Lyon, along with Ul, a powerful ice Mage who Jellal claimed could have been one of the Ten Wizard Saints, came investigating Deliora's destruction, and found Gray alive among the ruins. Ur took Gray in as her second student and taught him and Lyon Ice Make. Gray accepted the training in order to eventually avenge his deceased parents by killing Deliora using her unorthodox methods. Gray also inherited the unusual habit of stripping unconsciously from Ur.
When Gray heard of Deliora's current location, he decided to challenge it, ignoring Ur and Lyon's warnings. Gray collapsed from battling Deliora and woke up to see Ur battling it. Ur told him to take Lyon and run. Gray carried Lyon and saw that Ur had lost her leg and replaced it with ice. Suddenly, Lyon woke up and tried to cast Iced Shell, but Ur stopped him by freezing him. She explained to Gray that Iced Shell was the only thing that would beat Deliora, and was surprised to know that Lyon had tried to do what she planned. She then used Iced Shell which caused her body to be destroyed. Before turning into ice, she made Gray promise to tell Lyon that she died and told him to step into the future, since she would seal his darkness. The next day, Lyon woke up and discovered Deliora covered with ice and Ur's sacrifice. He blamed Gray for killing Ur.
Following Ur's advice to find strong wizards in the west, Gray arrived at Fairy Tail and asks the master for a way to reverse the effects of Iced Shell. Makarov, however, tells him that the only method that can possibly reverse it would kill Ur in the process.