Curate, connect, and discover
Post final battle, they're recovering. Al, instead of coming back to amestrias, ends up in Ra's Al Ghul's clutches. As he is obviously sickly, Ra's has him thrown into the Lazarus Pit, determined to train him and use him against the Bats and Birds of Gotham.
Alphonse Elric has spent a significant amount of his life as a soul bound to a suit of Armour. His biological father was a living Philosopher's Stone. He performed human transmutation and saw the Gate of Truth. When he gets thrown into the Pit, he performs an instinctual transmutation that turns the chemical infused, magic revival juice into a Philosopher's Stone.
While the League of Assassins is dumbfounded, Alphonse uses the imprints of knowledge he got from the pool before he transmuted it and leaves, trying to go to America and Gotham.
Meanwhile, Edward Elric is about to break a cosmic representation of knowledge for not giving his brother back.
So, Danny is Dick's younger brother. He was given up because he was born premature and had health issues. Dick didn't know or thought the baby didn't make it.
Fast forward, Dick is now Nightwing and Danny is Phantom. Danny is in Gotham, for whatever reason, and comes across someone who echos ectoplasm back at him, like a half formed core. It's familiar in a way he can't name.
That chemical that is used to make Talons, Dionesium, is a stabilizing force for halfas. Dick has trace amount in his system.
Danny, in trying to find this guy, keeps finding Talons, who are all ectoplasm starved halfas with injured cores. Danny quickly learns to be careful about them, so when Nightwing shows up, echoing ectoplasm, Danny treats him like a Feral cat.
Red Hood thinks this is hilarious until Danny does it to him too. (Per DC, the Lazarus Pits are impure Dionesium. Per fanon, the Lazarus Pits are rotten ectoplasm.) Danny doesn't know about that yet. All he knows, is he just found out he's not as alone as he thought and these two are even nice! Even if the one with a clearer core is very obviously sick with some kind of contamination.
situation is - Oh bollocks, it’s my ex. But instead of Constantine and King Shark, it’s Danny and Ra’s Al Ghul
Oh but Imagine Where this could Go!! Picture this:
For Some Reason, Danny is in Gotham (Maybe his Parents Dragged him and Jazz to a Ghost/Tech Convention, Maybe Jazz Started Attending Gotham Uni/Working at Arkham, Maybe he’s there to Help the Spirit of Gotham Regain some Energy, Maybe he’s there to Fix/Get Rid of the Lazarus Pit Beneath Gotham (that’s a thing right?), Maybe he’s just on Vacation, whatever) and he Runs into Jason.
They do the Spiderman Pointing meme cause “Hey you’re Dead!” And for Jason the Pit has Calmed down to the point of almost being Gone and it’s the Best he’s felt in Years while for Danny it’s like hearing a Baby Crying cause Jason’s Core is So Young/Unfinished/Deformed/Corrupted.
So they go to one of Jason’s Safehouses, and Danny opens a Portal and Calls on one of his New Kryptonian Guards, let’s call him Qyv-Ral (pulled from this Generator), and Asks him to Escort Jason to Frostbite in the Far Frozen for Healing. He Also Tells him that he can Contact Danny to come back here and Open the Portal for their Return once Jason is Healed (how exactly is Writers Choice idk atm). Danny would have Gone With them but he has Something to do in Gotham. All Parties agree, the Portal is Opened, Jason and Qyv-Ral Go Through, Danny Closes the Portal, and the Goes about his Day. Bonus Points for if they Never Refer to Danny by Any Name, except for the Very End where Qyv-Ral says something along the lines of “Farewell my King”. Bonus Bonus Points for Danny sounding very Menacing out of context.
Meanwhile Superman, who has been Listening in since he heard the name of the Kryptonian Guard, is Very Stressed because Who is Letting The Worst of the Worst Kryptonian Criminals Loose on Earth? He Immediately Calls Batman because this is Happening in Gotham of all places and The Bat is Immediately on Red Alert. He contacts All the Birds. Cue Panic when Red Hood Doesn’t Respond, no matter who calls (he usually at least responds to Babs or Dick Sometimes). The Bats come to The Only Possibel Conclusion: Jason has been Kidnapped by this new “King” of the Criminal Kryptonians (they are Wrong. In his Excitement to be Rid of the Pit Madness once and For All, Jason just didn’t think to Tell Anyone what was going on, adding to the Belief that he’s been Kidnapped by a Rouge Kryptonian haha oops)
That’s all I’ve got. I could see this being Either Anger Management (Jazz/Jason) Or Reddead (Danny/Jason) depending on how it gets written out if someone chooses to do so. Speaking of Which, Feel Free to Continue this!!! Just Tag me when you do cause I wanna see how this goes!! Especially if you take it to AO3!
Right, let's see... So, King Danny gets some housing complaints, some ghosts really are just spamming claims over non-ghost beings bothering them near their homes. So as the peacemaker he is, Danny simply goes there, a weird region of the Ghost zone really, they even named it differently because it wasn't green (among other odd quirks). He did find fun in the irony of it being called the "Phantom Zone". Anywho, the non-ghost beings there are obviously all the dangers the Justice League just doesn't deal with and dumps in that dimension. Staying in the Phantom zone for long enough (I'd say maybe a week) is sufficient enough for these beings to be considered "Infinite Realms" subjects despite not being dead. Like immigration or whatever. Dany, empathic enough due to the whole "stand out" and "odd ones out" mentality, takes all of them under his wing and in short adds them to his royal guard or other similar posts regarding their strengths.
So in short, you could say Danny was wrapped and gifted a bunch of Kryptonian soldiers for his already overpowered army.
May I add that the mentally deteriorating effects of the Phantom Region (as I'm calling it now) would probably affect the Kryptonians enough to view Danny as a divine savior after he pulled them out of madness and gave them purpose again? So they're probably very intense about their new positions and don't want to disappoint their king and grace in the slightest.