Gray Fullbuster/Relationships

Natsu Dragneel
Natsu and Gray are teammates that have had a close and competitive relationship since childhood, and as such usually start a fight whenever they lay eyes on one another. Lucy, however, believes that it's because the two use opposite elements in their Magic; Natsu using fire and Gray using ice. Natsu values Gray's life, as seen during the job that took place on Galuna Island, where Natsu stopped Gray from killing himself, twice, with Iced Shell. Gray paid back this act when Natsu was eaten by Fukuro, and even stayed to fight Racer during the Allied Forces' assault on the Oración Seis, giving Natsu a chance to escape.

Lucy Heartfilia
Lucy and Gray are good friends and members of the same team. Gray cares much for Lucy, going as far as to say that he would rather die than hand Lucy over to Phantom Lord. In return, Lucy is usually annoyed by Gray's stripping habit and his tendency to break into her house without his clothes, for which he has been beaten and scolded for. According to Gemini, who not only copies one's looks and abilities but also one's thoughts and memories, Gray's initial thoughts of Lucy are as follows:
 * Newcomer to the guild.
 * Looks rather cute.
 * Possesses some skill. (Somewhat interested in her in both the Japanese and French version of the anime)
 * More naïve than she appears to be.
 * Is a Celestial Spirit Mage.

Erza Scarlet
Gray and Erza belong to the same team and are very close friends. When Erza joined Fairy Tail, she mostly kept to herself, opting to ignore those who tried to converse with her, and even went as far as to insult Gray when he tried to do the same. Because of this, Gray had challenged her multiple times, though he always lost, which angered him and made him think that he couldn't accept Erza as a comrade. However, he later changed his mind when he saw her crying and concluded that for her not to cry, she needs to stay with them; with Fairy Tail.

Over the years, Erza slowly developed into an elder sister-esque figure towards Gray; Gray developed a fear of Erza, and whenever she is around he and Natsu, the two pretend to get along so as to not get beaten up by her. Despite this, Gray cares very deeply for Erza, as shown when he comforted her when she lost hope during their battle with Phantom Lord, and when he went to rescue her when she was kidnapped and taken to the Tower of Heaven, all despite her telling them to leave. Gray also believes in her strength, as seen when he refused to believe that she would be defeated by her former friends.

Happy
As members of the same team, Gray and Happy are good friends, despite Happy being the partner of Natsu, Gray's biggest rival. Gray always cares for Happy, viewing him as the youngest and least powerful member of Team Natsu. When Happy was kidnapped by Erza's old friends, Gray didn't give up on saving him, despite Erza's promise to bring him back safely. Unlike Natsu, Happy doesn't have any problems with Gray, which sometimes makes Happy act as a mediator in their rivalry or even praising Gray's skills and abilities, such as when he stated that Gray would surely defeat Bickslow, comparing his strength to Natsu's.

Juvia Lockser
Initially, Juvia was Gray's enemy as a member of Phantom Lord's strongest team: the Element 4. However, when the two met, she fell in love with Gray at first sight, and subsequently had trouble fighting him. During the fight, however, Gray stated that he would give his life in order to protect Phantom's target, Lucy, which angered Juvia considerably. Despite fighting seriously, Juvia wasn't able to defeat Gray, and the rain that always haunted her finally stopped, which left her convinced that Gray is the perfect man for her.

Juvia often tries to show her feelings by protecting Gray. After Phantom Lord disbanded, Juvia decided to join Gray's guild: Fairy Tail. She approached Gray in the casino where Team Natsu was reunited, and on the same occasion that Erza's old friends caused a riot, she shielded Gray from Simon's attack. Despite Gray's reluctance to let Juvia join, she keeps her word, protecting him twice and helping Gray's friends find Erza. Gray is also the source of Juvia's strength, as seen when she quickly shifted the tide during her fight with Meredy after the young Grimoire Heart girl stated that Gray is the one that she most wants to kill. These very same feelings for Gray were also strong enough to make a Sensory Link between the two.

Gray, however, doesn't overtly reciprocate Juvia's feelings, making Juvia's love seemingly one-sided. Gray notices Juvia's way of showing love, especially the unusual ways, and she stands totally submissive to Gray, annoying him at times. She even forces herself to do what Gray says, but in most of these instances he either doesn't understand or doesn't care, and his reactions are mostly indifferent, usually when Juvia tries to seduce him. Despite finding her annoying sometimes, Gray cares for Juvia as he would any guildmate, having once saved her from Ultear, and carried her in light of her extensive injuries.

In X791, however, Lyon Vastia, ironically, falls in love with Juvia, making her confused and a bit divided between the two Ice-Make Mages. Later, just before the Grand Magic Games qualification round, Juvia finds Gray in the city and asks him if he would eat with her; he is about to agree, but Lyon interrupts him. Lyon then proposes a bet: the one whose team wins the Grand Magic Games will have Juvia in their guild, but Gray says it's a stupid bet because she's already in their guild. When Gray and Erza talk after the second day of the Grand Magic Games, Erza mentions that Gray should have noticed Juvia's feelings towards him by now, and that he should try and make everything clear between them, causing Gray to silently blush. Later on, during the Great Banquet, Gray rejected her affection, though his words only made the woman more interested in him.

During their war with Tartarus, Gray and Juvia are sent to protect one of the ex-council members, but find him already deceased. On their returning to the guild, Juvia expresses her foreboding feeling about fighting something that had enough power to destroy the town, which they had just visited. Gray takes her hand in his, and comforts her, assuring her that he's with her. Later, while fighting Silver Fullbuster, he thinks about several people in his life while contemplating if he should use Iced Shell, most notably Natsu and Juvia, before apologizing, remembering he can't afford to die yet.

Loke
Gray and Loke are friends, having been guildmates for three years and sharing a fear of Erza. Gray also trusts Loke to the point that he would ask him to be his partner for his second S-Class Mage Promotion Trial. Not much else is known about their relationship, though the two were shown to be happy to see each other when Gray and the others returned from their seven year absence.

Cana Alberona
Not much is known about the relationship between Gray and Cana, but during their interview for the Sorcerer Magazine Gray mentioned that he has a good relationship with Cana, and that she also said the same thing.

Lyon Vastia
Lyon is Gray's longtime rival. Both were friends when Ur was their master, but after her death, their friendship ended, only to be rebuilt after the events that transpired on Galuna Island.

As Ur's pupils, despite some differences in their personalities, Gray and Lyon were friends. Lyon was the most enthusiastic and friendly one, being the eldest pupil, even giving Gray some hints about the Ice-Make training and telling him about his dreams, showing confidence in Gray. Gray, however, remained serious and cold due to the tragedy that befell him at the hands of Deliora. Everything changed when Gray decided to fight Deliora alone without finishing the training, which resulted in Ur's "death" via the forbidden spell Iced Shell, freezing her body forever. When Lyon realized that Ur was dead and that he would never be able to achieve his dream of defeating her, he blamed Gray, putting an end to the pupils' fragile friendship.

When Gray met Lyon after the incident, Lyon, under the alias "Reitei", was trying to unseal Deliora, having recruited Mages that had their lives radically changed by the Demon. The two fought twice: in the first battle Gray was held back while under the impression that Lyon didn't know that Ur was alive as ice, and as such was attempting to save him in the memory of their former teacher. Gray was, however, unsuccessful and was defeated by Lyon, who revealed that he had maintained his grudge after all the years that passed. In the second battle, however, Gray found out that Lyon knew about Ur's current state and defeated him, thereby defending Ur's memory. Despite still being on shaky terms, the hate between the two ended and Lyon joined Lamia Scale like Gray had advised.

Their rivalry and partnership continued during the battle against the Oración Seis when the two joined forces to fight Racer. During the course of their tag-team effort, Gray discovered that Lyon had started to perform Ice-Make the way that Ur taught them how, rather than just using it one-handed like he had been before. After figuring out Racer's weakness, Lyon and Gray attempt to defeat Racer by pretending to have succumbed to their rivalry; the plan succeeded. After they defeat Racer, Racer proceeds to attempt to blow all of them up by sacrificing himself, though Lyon took Racer down with him, which made Gray think that Lyon had died. Searching desperately for his friend, Gray tried to remain certain that Lyon survived. Lyon later reappeared, relatively unharmed by the explosion, much to Gray's relief.

When Gray and the rest of the Tenrou Team return in X791, Lyon falls in love with Juvia, causing her to become emotionally torn between the two Ice-Make Mages. To try and solve this problem, Gray and Lyon made a bet: the one whose team wins the Grand Magic Games will have Juvia join their respective guild.

Ultear Milkovich
Gray and Ultear first met when Ultear found Gray spying on her on Tenrou Island. She spoke of not wanting to fight anymore and expressed the desire to become friends with Gray, saying that they were practically brother and sister due to their relationship with Ultear's mother: Ur. Utilizing this connection, Ultear's intent was to manipulate Gray into sacrificing himself.

However, Gray sees through Ultear's lies and is instead enraged by her actions, attacking her as soon as the right opportunity presents itself. During their fight, Gray shows compassion for Ultear, remembering Ur's kind words to him right before she sacrificed herself, offering to seal away Ultear’s darkness. Once Gray defeats Ultear, he shares a story in which her mother only talked about how much she lover her. Though not keen on becoming allies of any sort, Gray remained apathetic towards the fact of Ultear being his enemy; as shown when he left her in the woodland.

After Gray and his friends return from their seven year disappearance, Gray and Ultear reunite as allies; during said encounter, she tells Erza to take good care of Gray. After Gray realizes that Ultear was the one who brought him back from death, he emotionally breaks down over her sacrifice, noting that both mother and daughter have saved him.

Gray Surge
The two Grays have a slightly antagonistic relationship as the two are the complete opposite of each other.

Their time spent with the other was brief, due to the fact that they only met during the battle with the Edolas Royal Army. There, the two became immediately confrontational as Gray Surge yelled at his counterpart to put on clothes and Gray yelled the opposite back. Despite their differences, Gray Surge took Gray's words to heart when he was sucked into the Anima and smiled gently as he watched him leave.

Ur
In the year X774, when his village is destroyed and his family killed by Deliora, a young Gray is found by Lyon and Ur who takes him in as her second apprentice, treating him as her own. Gray followed her unorthodox methods in order for him to have the power to defeat Deliora. However, despite Ur's objections, Gray went to fight Deliora prematurely. His actions resulted to Ur sacrificing herself to seal Deliora so as to save both him and Lyon, as well as seal Gray's darkness at the same time. Ur's sacrifice deeply affected Gray, as shown when he cried while listening to Lyra's song, which embodies the emotions of those listening to it. He has yet to move on from the ordeal, as any slight objection or insult towards Ur or her sacrifice sends him over the edge and forces him to take action, lest it be against Lyon, Ur's other apprentice, or Ultear, the woman's own daughter. However, Gray later learned that he needs to walk his own path and that he cannot follow Ur's will forever.

Daphne
Gray and Daphne have a purely professional relationship, as the two used each other to achieve the other's means. Daphne was the enemy of Fairy Tail, and it was thought that, at the time, Gray was her willing partner. It soon became apparent, however, that Gray had simply pretended to be her partner in order to get Natsu to keep his promise to the citizens of the City Without Sound and to get Natsu into the Dragonoid so he could destroy it. After this, Gray joined the Fairy Tail Mages in defeating Daphne and saving Magnolia Town.