JayDick

JayDick is the family ship between Dick Grayson and Jason Todd from the DC Comics fandom.

Canon
Both Dick Grayson and Jason Todd were taken in by Bruce Wayne on separate occasions, that's how Jason inherited Dick's former title as Robin when he left Batman's side to become Nightwing. Just as Jason had departed from his side to become Red Hood.

Jason doesn't exactly have a strained relationship with Dick, but it was mostly based around trying to prove himself better than Dick. As for Dick, he comes off as an older brother figure to Jason, as well as the Robins who have come after them; since Dick being the first Robin has him feeling an obsession to be there for those who have inherited their former titles and have became Bruce's wards like they have.

Films
The Autumn of Terra set Batman film, Gotham by Gaslight features Dick and Jason as orphan children beside Tim, who are forced to steal for Big Bill Dusk. Because neither of them have parents and have had much taken away from them, the boys became each other's family. Dick being the oldest has him looking out for Jason, even though Jason had first appeared as the leader of the three when they tried to attack an elderly couple for money, while Dick reminds Jason to not use their names in front of their targets. They have heard rumours of Batman but didn't believe in them, as the two tell Tim that he is only thing that grownups make up to ensure that kids like them behave. Until the night they come face to face with the Batman himself, who tells the three to return to their mothers. Dick and Jason tell him that they don't parents and are each other's family, while taking back from Gotham as they know that Big Bill will only come after them if they were to run away from him. This gets Batman to give the boys a chance to get a head start when they go to seek refuge at a church that takes in orphans. When Alfred caught Jason trying to steal from one of the carriages Dick asks him to not turn Jason over to the police, before scolding Jason for going against what Sister Lesly had been trying to teach them at her funerial. Because Alfred showed them kindness by giving them food, Dick, Jason and Tim agree to deliver an unknown package. Not knowing that is in it has Jason wanting to steal it, along with the cart and the horse, but Dick was on Tim's to do what they were asked. Along with reminding Jason that he is one of the three who can read. After they help Alfred and Tim save Batman and Salina, Dick and Jason tell them that they shouldn't be sad for the burning fair and that all of them can create something that is real and better.

Fanon
Because the two were wards of Bruce Wayne, aka Batman, and they both went by "Robin" before going out on their own under a different alter ego title, fans see them as brothers. As there have been a few brother-like moments between them. Another group of fans, however, take in the fact that the two aren't related by blood and like to use it as a means to slash ship them instead.

Fanworks of the pairing have appeared on YouTube, Archive of Our Own, Tumblr, DeviantART, Wattpad, and Fanfiction.net. Based on works posted at Ao3, it is the most popular pairing for both of these characters and is particularly popular in the DC comics fandom. This pairing also appears in Teen Titans and Young Justice fandoms. It is also the second most popular pairing in the live actions Titans TV series fandom, despite the two's limited interactions.

Fandom
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Trivia

 * The two are set to appear in Gotham Knights.