Dimileth

Dimileth is the het ship between Dimitri and Byleth from the Fire Emblem fandom.

Pre-Academy
Dimitri and Byleth first meet when Byleth and their father, Jeralt rescue him along with, Edelgard and Claude from bandits. Byleth's display of bravery and skills as a mercenary greatly impresses the three lords. Much like the other two lords, Dimitri praises Byleth for their battle prowess and proposes that they return to the kingdom with him to lend their services. According to Byleth's first impression of Dimitri, he seems to be a sincere man but they sense a darkness within.

Byleth and Jeralt are summoned to Garegg Mach Monastery. Upon arriving at the monastery, the three lords walk alongside Byleth to which Dimitri offers to show them around. Byleth is then given the choice of leading one of the academy's three houses in which Dimitri is the house leader of the Blue Lions. Before making a final decision, Byleth is tasked to talk to the house leaders about their class. Dimitri apologizes to Byleth for not formally introducing himself the other day and once again, thanks them for rescuing them.

Blue Lions Route
If Byleth chose to teach the Blue Lions, Dimitri and Byleth slowly grow closer over the moons. Dimitri thinks highly of Byleth's skills and will often shower them sincerely with praise. Despite this admiration, Dimitri admits to Byleth that their lack of emotion and indifference about killing their enemies bothered him at first. However, as he spent more time with Byleth and got to know them better, he sees that they aren't like that at all. He now knows that he can trust Byleth with all his heart.

Dimitri doesn't come off unhinged for some time until their hostile encounters with the Flame Emperor and Those Who Slither in the Dark which slowly drive Dimitri to become more ruthless. After the remire village incident, Dimitri tells Byleth about the Tragedy of Duscur which took the lives of his family and close friends. Being the only survivor of the tragedy, Dimitri reveals to Byleth that the reason he came to the academy is for revenge. When he leaves the room, Byleth is visibly concerned.

Later on during the Ethereal moon, a ball is held. Byleth steps out of the celebration only to come across Dimitri who was also worn out by the festivities. Dimitri confides to Byleth about his stepsister, Edelgard. He recalls the fond memories he shared with Edelgard as a child and how he gave her a dagger as a parting gift. Byleth insists that he should reconnect with his stepsister but he says its far too late for that. If Byleth chose Dimitri for the goddess tower event, he will invite Byleth to go with him to the tower. Otherwise, he will go back to the ball.

After Jeralt's death, Byleth is stricken with grief and refuses to go out of their room for some time. When they do come out, they go to Jeralt's quarters to read his journal. Instead of Alois, Dimitri himself will come to see Byleth. Dimitri, seeing the emotional state of his professor, consoles them and tells them that its okay to cry because eventually, their tears will dry and that they have to find something to keep living for despite the sadness. Dimitri also shares a bit of how he felt when he lost his family too and how it gave him the will the go on living. Before he leaves Byleth alone, he assures Byleth that he intends to stand by their side no matter what happens. Later on when Byleth finally comes outside, Dimitri will be relieved to see them. However, remembering the injustice of Jeralt's death, he tells Byleth that he would kill anyone if they ask him of it.

The whereabouts of Jeralt's killers are found and Byleth is determined to avenge their father. Dimitri gladly offers to help. Byleth chases after Kronya who retreats further into the forest. There, Solon banishes Byleth into the darkness. The students are shocked to see their Professor disappear. Dimitri is enraged at what Solon had done to Byleth and becomes ruthless. Byleth fuses with Sothis and returns to defeat Solon. After the battle, Dimitri is relieved that Byleth is not hurt. Byleth faints from exhaustion and Dimitri carries them back to camp.

The last thread of Dimitri's sanity snaps when the Flame Emperor is unmasked and revealed to be Edelgard. As Dimitri approaches Edelgard and her forces, Byleth is visibly worried and attempts to stop Dimitri from killing his stepsister but he shoves their hand away. Outraged over Edelgard's perceived involvement in his family's death, Dimitri snaps and slaughters her remaining forces forcing her to retreat.

Edelgard ascends the Adrestian Empire's throne and declares war on the Church of Seiros. Dimitri fights beside Claude in the front lines to protect the Monastery from invasion. Although Edelgard and her vanguard are repelled, the invaders are reinforced by a larger army, forcing Rhea to enter the fray as The Immaculate One. Byleth attempts to aid her, but Thales sends them plummeting into a ravine. Garegg Mach falls. Byleth goes missingfor five years.

Time Skip: Azure Moon
Dimitri is framed by Cornelia for the murder of his Uncle Rufus. The disappearance of Byleth and Dedue's apparent sacrifice further deranged Dimitri's already crumbled sanity. After he escapes his execution in Fhirdiad, he is presumed dead by many. He then lives a solitary life as a vagabond. Rumors of a sadistic warrior capable of slaying scores of soldiers begin to propagate throughout the Empire.

Byleth is awoken by Sothis and returns to the monastery in hopes of reuniting with their students. In the Goddess tower, Byleth stumbles upon corpses of imperial soldiers and finds Dimitri, now a shell of his former self, alone in the ruins of the Monastery. Byleth walks over to him and reaches for his hand but he looks away and refuses to reach back. He mistakes Byleth for a ghost but realizes that they are alive.

Byleth and Dimitri eventually reunite with the rest of the Blue Lions along with the Knights of Seiros. Dimitri immediately plans on killing Edelgard by mobilizing his allies. With Byleth as the acting leader of the church of Seiros, together, they intend to stop Edelgard's conquest.

With Dimitri at his worst moments, Byleth continues to aid him and never gives up on him just as their allies hope that they can bring him back to his senses. Some time after Rodrigue's sacrifice, a devastated Dimitri attempts to set out for Enbarr but Byleth stops him. Dimitri despairs at how its pointless to move on for the sake of the dead to which Byleth reminds him that he should live for what he believes in instead. As a heavy downpour begins to fall, Byleth offers their hand to Dimitri and this time, Dimitri finally accepts their hand noting how warm it is. Dimitri begins to question what he is really fighting for and begins to apologize to everyone for his foolishness and to atone for his sins. Byleth and The Blue lions then continue to fight alongside him.

Byleth helps Dimitri reclaim the kingdom and save his people from Cornelia's tyranny. With Byleth's insistence that he face his people, Dimitri with Byleth and Gilbert at his side, reluctantly walks out onto the castle balcony to find the people of Faerghus cheering his return. Dimitri takes his rightful place as King of Faerghus. After reclaiming the capital, a celebration was held. Dimitri finds Byleth outside and asks if they have worn out from the festivities. He confides in Byleth that he was always afraid of going near the graves of his loved ones but now he knows that he should't stay away forever. He thanks Byleth for teaching him how to live. He would have died a fruitless death in battle if Byleth wasn't there with him.

Dimitri is devastated to know of his stepmother, Patricia's likely involvement in the tragedy of Duscur. Byleth finds him in the Cathedral at night, pondering over the revelation about Patricia. Dimitri tells Byleth that even if his stepmother never loved him, he is not to be pitied as he has dear friends and allies who cares for him and now, he has Byleth by his side.

After Dimitri defeats a transformed Edelgard in battle, he attempts to reconcile with his stepsister. Byleth smiles at the sight of the two until Edelgard throws the dagger to his shoulder prompting him to kill her. Dimitri and Byleth walks away from the throne room but as they are about to step outside, Dimitri stops and tries to look back but Byleth grabs his hand with a pleading expression. They then walk out of the throne room together with the people cheering outside.

Post-War
Dimitri is crowned king and Byleth becomes the new archbishop. Their marriage gave the people of fodlan much to celebrate. As leaders of the church and state respectively, they devoted themselves to improving life for the people. Because of their positions, at times, the two engaged in heated debate. but even still, when enjoying a long horse ride or spending a quiet evening together, they were not as the world saw them but rather two adoring spouses who were desperately in love and they remained that way for the rest of their days.

Moments

 * In Chapter 6: Rumors of a Reaper, Byleth smiles genuinely for the first time and if Byleth repeats the same expression as Dimitri asks of them, his support points will go up and he will call it mesmerizing.
 * After winning the battle of the Eagle and the Lion, Dimitri tells Byleth that he loves seeing them happy like this and that the look on their face may be the best reward of the day.
 * After the celebration, Dimitri tells Byleth about how wonderful the day has been and opens up to them about his first impression on Byleth and admits that he is glad to have met them. However, their conversation is interrupted by Sylvain with the rest of the Blue Lions. If Byleth is female, Sylvain interrupts by telling the two that they're being cozy without him. For male Byleth, Sylvain will ask to join them instead.


 * In Sothis' Paralogue, Tales of the Red Canyon, Dimitri is the only lord who scolds Byleth for venturing into the canyon alone while most of the characters took it as good battle experience.
 * In the goddess tower event, Dimitri asks Byleth if they should wish "that we'll be together forever". There's a moment of silence of between the two as Byleth gives Dimitri a questioning look. To break the silence, he plays it off as a joke. Byleth is visibly disappointed regardless of the response chosen. He apologizes to Byleth and says that he isn't even sure if he can really "have a future to promise to someone". Byleth responds to this with a smile.
 * In Chapter 10: Where the Goddess Dwells, after Byleth tells Dimitri they received powers from the Goddess, He enthusiastically alludes to Byleth being Seiros. He cuts himself before he could say who he would be.
 * After Jeralt's death, Dimitri will let slip that Byleth has been on his mind but immediately corrects himself that everyone was worried.
 * As thanks for helping Dimitri teach swordsmanship to the children, he offers to take Byleth to dinner.
 * In the time skip, tea time is held in Byleth's room. One of Dimitri's unique tea time dialogue, is him telling Byleth that he would invite them to his quarters next but his room is "too bare". He also notes how he feels comfortable and could relax in Byleth's room.
 * In Chapter 20: The Impregnable Fortress, The Death Knight expresses his fixation on clashing with the sword of the creator. If Dimitri is put against him, the Death Knight will reproach Dimitri for standing against him and Byleth to which Dimitri responds that he would.
 * In Silver Snow, Byleth is visibly shocked and disappointed to hear the news of Dimitri's death. Later on, Byleth unexpectedly meets Dimitri one evening. He tells Byleth his regrets and explains to Byleth about his decision. But right before he does, Byleth wakes up. Whether it was his ghost or Byleth dreaming about him is unknown.

Fanon
The ship is one of the most popular romances of Fire Emblem Three Houses. Although, Dimitri can only be romanced by a female Byleth, Dimitri with male Byleth is also loved by many fans. Fans also sees that Dimitri and Byleth parallels Byleth's parents, Jeralt and Sitri.

Fans love the ship's subversive take on the classic "beauty and the beast" trope because Byleth knew and befriended Dimitri before he snapped, and also, there were implications of an underlying attraction between the two. In other words, there is no "girl or boy meets beast and instinctively knows he's a good person deep inside" but rather they want to get their friend, who's suffering back to his senses. Byleth knows Dimitri is a good person because he had always been when they met. The parallel between the two in part 1 & 2, is that Byleth is initially the stoic "ashen demon" who learns from their time with the students and Dimitri to be more empathetic and warm. In turn, Dimitri is the warm young man who learns again from his Professor how to regain his compassion and kindness that he lost sight of.

In the last part of the ending cut scene, Byleth grabs Dimitri's hand. Since it did not show that Byleth let go of his hand, some fans believe that they walked out of the palace together holding hands as the people cheered.

In some of Dimitri's paired endings, he will always die earlier than his partner due to illness. Because of his paired ending with Byleth stating that they loved each other for the rest of their days, some fans speculate that Byleth makes Dimitri immortal. However, in fan fiction, many fans also love the idea of Dimitri being reincarnated and Byleth meeting him again.

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Trivia

 * "A place to rest" is the music that plays in majority of the S-supports in the game. Dimitri is the only Lord in which the music for his S-support is "Somewhere to belong". This usually plays only on support conversations and platonic S-Supports. However, Hubert is also the other exception.
 * In Chapter 10: Where the Goddess Dwells, Dimitri is the only lord who will carry Byleth back to camp regardless of their gender. If Byleth is female, Dimitri will first apologize before carrying her.
 * Dimitri is the only character who invites Byleth directly to the Goddess tower.
 * Dimitri is the only lord who immediately comes to see Byleth after Jeralt's death. In other routes, Alois comes to see Byleth first before the other lords.
 * In his tea time dialogue during pre time skip, he chats about how he loves going for a long horse ride on his own. His ending with Byleth, where they spend time together going for a long horse ride is the only other time it was ever mentioned.
 * Due to Dimitri's unavailability to deepen bonds in most of part 2, raising his support points by way of Dialogue choices is only possible during part 1. When Dimitri is finally able to raise his supports again, whatever the choice Byleth responds with won't affect his support points anymore. Raising support points by viewing his A-support, having tea time, training, eating and cooking with Dimitri will still take effect.
 * Azure moon is the only ending mural in the game in which Byleth is present together with the route's respective Lord.
 * In the English localization of the S-support, Dimitri calls Byleth his "beloved" while in the original translation, he calls Byleth "Irreplaceable".
 * On multiple occasions, Dimitri's English voice actor, Chris Hackney, says that his OTP is Dimileth.
 * In ANIME Impulse's Sneaky Eating Challenge with the Voice Actors of Fire Emblem Three Houses, one of the hilarious fan favorite moments is when Chris was asked who Dimitri's canonical spouse is. Without hesitation, he responds that it's Byleth.
 * Natsuki Takaya, a japanese manga artist, best known for creating the series Fruits Basket, drew an illustration of Dimitri and female Byleth.
 * Kaoru Hagiya, an illustrator for Fire Emblem Cipher art, shared his illustration of Dimitri and female Byleth along with Dimitri's Cipher art cards.
 * In Fire Emblem Heroes, the only playable party members for the tactics drill: Over the Azure Moon (Skill Studies 99), is Legendary Dimitri alongside Female Byleth.