Overprotective Father
Of all the things that Danny imagined when he decided to release Dan from his prison, he never thought that he would become his father. And while it was a little weird, he could see the point in it. Dan wasn't his future self, he was a combination between him and Vlad (something he really hated to think about), meaning, technically his son.
Dan also seemed uncomfortable with the new arrangement but he seemed much happier, and since being given access to the castle garden he was actually quite calm. Probably because of his unlimited access to ghost fruits. Who knew that all it took to stop his attempts of world conquest was a couple of ghost strawberries?
The father/son thing continued to be awkward, but they actually grew to like it (as much as Dan denied it). And that was okay, until Dan started... dating people.
And that was fine, really, Dan could date whoever he wanted (although he was too young in the halfa's opinion) but his choices weren't ideal: King Shark, Metron, Constantine, Darkseid, Bane, Morpheus, Brainiac, Deadshot, and more were added to the list. Even as the Ghost King Danny had a headache just thinking about it.
Danny didn't know what the hell Dan was seeing in them, but he decided it was time to interfere. Unfortunately for the Justice League, Danny decided to act like a father just as Dan started dating one of their members. So now an overprotective Ghost King was giving the entire meeting a shovel talk. Ellie was laughing in the background as Dan covered his face, his father was fucking embarrassing.