Jeanluc

Jeanluc is the het ship between Jean Gunnhildr and Diluc Ragnvindr from the Genshin Impact fandom.

Canon
The two knew each other back during Diluc's time as part of the Knights of Favonius, where he was Jean's superior. However, after his father's death, Diluc was infuriated with the Knights due to the way they handled the aftermath of the incident, and so he quit. The whole experience made him very critical of the organization—and though Jean understands why he feels that way and why he harbors such animosity towards them, she expresses her hope that one day she, through her work, will be able to better his view on Knights.

Archon Quest
In Act II of the Mondstadt Chapter, Venti and the traveler go to the Angel's Share once it closes down after their plan to steal the Holy Lyre Der Himmel backfires. Upon entering, the two of them see Jean and Diluc beside each other, waiting for them. Jean is surprised that the traveler ended up being the one who tried to steal the lyre. Venti and the traveler explain how Dvalin was poisoned long ago and corrupted by the Abyss upon waking from its slumber, but Diluc thought their story was too farfetched to be believable and told Venti repeat the tale that he'd sung Diluc previously.

Before he can, however, Jean says that won't be necessary and that she believe the two of them—though she says she will only be able to assist in private, due to diplomatic issues associated with the Knights. Diluc scoffs and remarks how that's a reason he doesn't like the Knights--their inneficiency--though he remarks that he's surprised by how quickly Jean believed the traveler, given that they're an outlander. Jean, however, says that even with his own cautious personality, he still trusts them. She calls him "sir," to which he replies he'd already told her not to call him that—but ultimately dismisses it due to the fact that they don't get to work together often anymore. The traveler (unaware of their previous affiliations) questions this, to which they say nothing. Paimon and Venti note the uncomfortable atmosphere.

Later on in the story quest, when the group heads to Starsnatch Cliff to summon Dvalin, the topic of pets is brought up (due to Paimon questioning if the dragon was technically Venti's pet), and Jean mentions that, when she was younger, she had a pet tortoise. Paimon finds it rather odd for Jean to have had a tortoise for a pet, and asks Diluc if he found it strange at all as well. Diluc responds by telling her that he doesn't, as he also had one when he was a child, to which Paimon is shocked.

Diluc and Jean also accompanies the traveler, Paimon and Venti to Stormterror’s Lair, where they fight against Dvalin and managed to purify Dvalin’s corruption.

Leo Minor
At the end of Jean's story quest, Jean asks her friends how they were able to prepare the party for her at the Angel's Share. Though Kaeya tells her that the key organizer was the traveler, he also admits that they've Diluc to thank for the venue and for offering to pay their bill. Diluc then says that despite his initial reluctance to sponsor a Knights of Favonius event in any way, he, like any other citizen of Mondstadt, owes Jean his gratitude for her hard work, and that's why he went through with the plan.

Jean is touched by his praise and seems to be at loss for words, as she responds, “Master Diluc, I...”. However, she didn’t finish her sentence as she was interrupted by Barbara soon after, telling everyone to stop crowding Jean.

Midsummer Island Adventure
If you talk to Kaeya on the islands the night before the water forcefield on Klee's island is removed, Kaeya will mention to the traveler that part of the reason why he wanted to come to the Golden Apple Archipelago was because he was curious to see both the Acting Grand Master (Jean) and the former Cavalry Captain (Diluc) being in the same place.

Webtoon
In the sixth chapter of the Genshin webcomic, Jean recognizes Diluc's father being the previous owner of a delusion mentioned in tattered research papers by the Fatui. She then sends Lisa to question Diluc about his involvement in the recent Black Fire incident. Diluc is surprised that Lisa knows about his father's death because it was supposed to be a secret, and concludes that Jean must have told Lisa about it, which she affirms.

Quotes
"Trifling matters can become Jean's greatest enemy."

- Diluc's voiceline "About Jean: Enemies"

"Her unparalleled sense of responsibility is the sole reason why she still hasn't found her true calling."

- Diluc's voiceline "About Jean: Responsibilities"

"Master Diluc has his reasons for being so critical of the Knights of Favonius. I am not proud of the way things went, but I cannot change the past. All I can do is keep working hard, in the hope he may one day see us in a better light... This is my duty."

- Jean's voiceline "About Diluc: Dissilusion"

"Master Diluc is my senior, and I have the utmost respect for him. Though we have gone separate ways, I can sense we share the same strong commitment to protecting Mondstadt at all costs."

- Jean's voiceline "About Diluc: Respect"

"My cautious and meticulous superior, even you trust [them]. Don't you, sir?"

- Jean to Diluc about the traveler

Fanon
Jeanluc is fairly popular, and the pairing has over 300 works on Archive of Our Own. While ships such as Jeanlisa and KaeLuc have a bigger following, it has retained a rather large fanbase since the game's initial release and has steadily remained one of the most popular shipping options for both Jean and Diluc. Some fans of the ship like to joke that Klee is Jean and Diluc's child, as she shares Diluc's red eyes and pyro vision along with Jean's blonde hair.

Since in one of Jean’s birthday illustrations, Jean receives signature food from her family and colleagues for her celebratory lunch (Kaeya’s Fruity Skewers, Lisa’s Mysterious Spaghetti, Amber’s Steak, Klee’s Toast, and Barbara’s Spicy Stew), ship fans think that a glass of apple cider, evidently from the Angel’s Share, is a hint to be from Diluc.

Fandom
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Trivia

 * Diluc and Jean appear together on the first Wanderlust Invocation banner (Version 1.0). They also appeared together in the Closed Beta Test (CBT) banner.
 * In an ad in which they are featured together, they both go to the Secret Heart Shaped Island and activate the mechanism for the luxurious chest by standing in the middle of the heart together.
 * Both Jean and Diluc owned tortoises as pets when they were children.
 * Both use Resistance talent books and Dvalin's Plumes for their talent ascension materials.
 * Both Jean and Diluc are the only Mondstadt citizens that are aware of Venti’s identity as the Anemo Archon, Barbatos — due to the fact that they accompanied him and the traveler on the Archon quest to defeat Dvalin in Stormterror’s Lair. There is also poetic symbolism in Jean and Diluc being the two nobles to help Venti, as they are both descendants of Gunnhildr and Ragnvindr, the noble families that helped Venti’s rebellion against Decarabian and later, to overturn the corrupted Aristocracy reign. It is hinted that a Gunnhildr and Ragnvindr will always come to aid Barbatos in times of need.
 * A book detailing Jean's lineage, Biography of Gunnhildr, can be found inside Diluc’s mansion (Dawn Winery).
 * Jean and Diluc are often compared to be equal in strength by Mondstadt citizens. Paimon and traveler even had an argument in the traveler’s voicelines about Diluc or Jean being the strongest person in Mondstadt.
 * The swimsuit that Jean wore in the 1.6 update Midsummer Island Adventure event was a collaboration project in which the Knights of Favonius + Diluc helped create the outfit. Kaeya was the one who convinced Diluc to hire a tailor to tweak the design.