Just had a story idea pop into my mind.
So ghost king Danny Phantom. The GIW nearly destroyed both their reality and part of the infinite realms so now a lot of ghosts want reassures that that won't happen again.
Danny's home realty is also in the DCU so Danny and his council are having to negotiate with, funny enough, a large chunk of the infinite realms population alongside the Justice league. Thankfully the mob is relatively organized and gave them a list of demands.
1 of the demands is a marriage alliance.
Clockwork told Danny for the marriage to be between 2 young people of his generation.
The GIW are disbanded and anyone directly responsible for the damage jailed, the demand was for them to be killed, but they managed to get the mob to accept lifelong jail sentence and a 2nd jail sentence if they become ghosts.
Danny is putting a lot of thought into the marriage alliance because the ghosts will not accept the pair getting divorced later on or calling off the marriage.
Danny is stressing because he's only 16.
Ideally its going to be between someone close to him and someone important on the other side, a similarly aged relative of either a ruler, a politician or a member of the Justice league.
Something something Danny is allowed to know the Bats are the Waynes and he tells them who he is.
Batman let's Danny get to know his kids, his youngest happens to be 15. As Danny gets to know him and the rest of the teen heros around his age the more he's seeing similarities between Damian and Sam. That pairing could work. Time to talk to them about it.
1st he talks to Sam see if she'd be willing to be in an arranged marriage for him and who he'd try to see if he'd be willing to marry her.
When asking Damian if he'd be willing to be the other half of the marriage alliance Danny gives him as list of pros for doing this: he and Sam have a number of same or similar interests with their love and care for animals and the environment. Similar diet preferences , Sam is trained to fight ghosts and can easily learn how to change that to humans so she's not helpless.
Her family is on a lower rung of rich but still within plausible beliveability of them meeting and caring enough to get married when they get older. Clockwork told Danny that even if they don't fall in love, then they'll at least be friends so it won't be a miserable marriage.
And lastly a member of team Phantom who is a liminal member of the Ghost king's fraid being offered up with the similarly aged son of 1 of the founders of the Justice League who try to protect everyone would look good to the mob of subjects.