DamiMar'iJon

DamiMar'iJon is the poly ship between Damian Wayne, Mar'i Grayson and Jonathan Kent from the DC Comics fandom.

Canon
Damian Wayne is the son of Batman and Talia al Ghul. This makes him an heir to the world's greatest crime-fighter, and its greatest super-villain Ra's al Ghul. Damian became the fifth Robin, working alongside his father as Batman.

Mar'i Grayson, Nightstar, is the daughter of Teen Titans Robin and Starfire in the not too distant future. Her mother died from a circulatory illness when she was young. This happened despite Bruce Wayne's best efforts to help Starfire. Her relationship with her father was somewhat strained due to them being on opposite sides of the conflict. By contrast, she shared a close relationship with Bruce Wayne whom she called Gramps. However, as she grew older, she realized that the world was not the one her parents knew. As such, she devolved into a vigilante, striking out at other metahumans for little or no reason.

Jonathan "Jon" Kent is the firstborn son of Kryptonian superhero Superman and news reporter Lois Lane. He fought crime alongside his father as the young hero Superboy. After growing up in a short period of time, Jon went to the future and joined the Legion of Super-Heroes before returning to the present just in time to pick up the mantle of Superman.

Fanon
The three of them haven't met. However, this didn't stop fans from shipping them because of their similarities, such as tragic past, family issues, etc. In the DC comics, Damian and Jon have met in a series of comics called "Super Sons" and Damian and Mar'i have met in the "Kingdome Come" comic series. Thus, they make individual ships: DamiJon and Demonfire.

Writers portray Mar'i and Jon a bubbly personality and they mostly bond over the fact that they are hybrids. For example, Mar'i being half Tamaranean and Jon being a half Kryptonian. Both of them thoroughly enjoy troubling Damian.

Fandom
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Variations

 * Demonfire refer to the ship between Damian and Mar'i
 * DamiJon refer to the ship between Damian and Jon