Due to a problem in Amity Park with their parents, Jazz decided that it was in Danny's best interest to move in with her until she could have full custody of him, the legal process was really long when you had no connections, her brother was happy with that arrangement.
However when he decided to move to Gotham with Jazz, Danny heard rumors about Bruce Wayne and his entourage of black-haired, blue-eyed children, similarly there were other rumors about the "Gotham Knight" who kept adopting children and transforming them into "Robin", or at least, that's what the kids on the Alley told him.
So, he made the most logical decision possible: he applied for a restraining order, for both: Batman and Bruce Wayne, he justified in court that it was for his own safety and he had nothing against them but he preferred if they stayed far from him, considering his trauma it was for the better. Jazz supported him and gave her professional opinion which sped up the process; Harvey Dent found the case hilarious so he supported the siblings and they got the court order.
For his part, Bruce was extremely confused when he found Jason laughing at a document that had arrived in the mail at the mansion, his confusion only increased when his League communicator beeped, alerting him to an urgent call from Flash.
Danny became the new underground Gotham's doctor, unlike Dr.Leslie he treats anyone as long as they're willing to find him (and it is hard if is not the right time) and pay the price.
This may sound extremely sinister but the reality was that Danny was not interested in money; he was already King of a dimension and his funds were not going to run out while he was on vacations.
The treatments vary, along with the reviews, but this is due to the prices he give. When Danny treated the Joker, the clown ended up shaking and almost regretting his actions, falling into a laugh full of madness (Danny's price was simple: Face the same thing you put your victims through)
But when Dr. Freeze knocked on his door, tearfully begging to treat Nora, Danny cured her, his price being a smile and a plea "Live happily with your wife for as long as you can."
With all the knowledge that Frostbite teach him combined with Clockwork showing him all human advances on the future (is not illegal if your ghost parent show you) he rented a warehouse and with the help of some ghosts he dig a hole the same size as the warehouse but meters underground, after that he used his powers and sinked it directly into the hole; he developed all his machinery there, turning it into a Bunker that he was the only one who could access.
Therefore, Danny was a mystery, a danger, his prices were varied and he treated anyone: villain, hero, anti-hero, mafia, criminals, innocents, metas, etc. but your values and actions were what whispered your charge and not even an extremely high amount of money would convince him of giving you a different treatment.
Of course, when Jason jokingly visited him asking to cure the pits (He knew it had no cure), his slightest hope was rewarded when the Doctor simply smiled and accepted (His price? A date).
After Danny was crowned he decided that the truce party had to have a counterpart, after all ghosts became friends mostly through battles, and he assumed that one day letting them fight wouldn't be a bad thing, it might even help stir up some grudges.
This was how High King Phantom, ruler of the infinite realms inaugurated the long-awaited "Day of War" or just "War Day", a moment when the Infinite Realms naturally became chaotic; alliances were allowed but it was not advisable to trust on them.
And of course, you were free not to participate, you just had to put a blue or green band on your arm, or a little green clock in the backyard of your haunt so the ghosts would leave you, your haunt or your territory in general alone.
Danny thought of it as some kind of giant paintball day, only with no paintballs and full of aggressive ghosts with various powers, it was especially exciting since everyone knew there would be no hard feelings after it and they would end up in the king's palace eating sweets as little children.
They usually celebrated it on a day close to any celebration related to death in human world, when their powers were especially powerful and therefore everyone could have more fun.
The problem was that since Danny had human friends (liminals?) who came to play, they didn't really consider it weird when some humans fell into the realms by a natural portal, and since they weren't wearing any blue or green arm bands they were definitely in the game.
For their part, the family of bats along with some League allies found themselves literally standing on a field of war where everyone seemed to be going for the kill, Jason was strangely excited about it, as was Damian.
When Dick asked one of the locals for an explanation, a guy on a motorbike threw him into the air laughing and yelled "LET THE HUNGER GAMES BEGIN!"
After Danny died he noticed that some animals had become more attached to him while others had moved away. Aggressive or death related animals seemed to react positively to his presence, although friendlier animals such as birds tended to fly away.
Of course, none of this prepared him for the number of crows that landed on his window daily. At first he was scared that they would consider him a corpse and try to eat him but after the third time they brought him a shiny object he assumed they just liked him.
Those crows became very fond of him, they let him pet them, they would perch on his head or shoulders, always present and sometimes even watching over him (A particularly intelligent crow he named Poe would drive his parents away with distractions).
So when he moved to Gotham to complete his studies he prepared for a farewell to his feathered friends; said friends simply ignored him and followed him around the city. Danny assumed he wasn't going to be able to fight them, so he let them be.
This is how the phenomenon called "The Invasion of Crows" began in Gotham, the animals were not aggressive but mostly indifferent, some of them agreed to carry letters as homing pigeons (After Danny asked them for the favor) starting "Crow services"
As long as you had the money or something shiny to pay them the birds would carry messages from one place to another, ironically they would give that payment to Danny, who only sighed and let them pass to his apartment, giving them: some food, shelter and a place to sleep, although he was worried the moment his neighbor would complain about the noise.
At first he let them stay on the streets because they were supposed to be free, but after the sixth time he caught Damian Wayne trying to adopt one he just rolled his eyes and now the little ones were living with him.
So yes, when Jason finally decided to visit his neighbor he didn't expect the red eyed crowd staring at him and judging his actions, one in particular lunged at him and he swore he was about to gouge his eyes out before a voice yelled "Poe, wait! "
Said crow looked at him for a few more seconds before perch on the head of the prettiest boy he had ever seen, who approached to offer him a hand "I'm sorry, they're very overprotective" he muttered worried.
Jason almost fell over laughing when he noticed that this was B's "weird case" about the rise in crows alongside the supposed "new rogue" in town, when all he saw was a college boy with a murder of crows living in his house, maybe creating a new messaging system.
He was going to have so much fun with this, maybe he'd even manage to go on a date with his eyes intact, who knows.
PUT IN THE BOX
Eruhaben: *puts down a box*
Eruhaben: Put in the box the most precious thing to you.
Raon: Can I put weak human-
On: I'm putting Cale nya~
Hong: Me too nya~
Eruhaben: You can't-
Lily: Oh! I want to put Orabuni too!
Basen: Agreed, Hyung is the most precious.
Alberu: I guess the children are right, my dongsaeng is indeed the most precious.
Choi Han: Wait, let me find Cale-nim.
Rosalyn: Let me help
Lock: I'll help too!
Ron: I think I saw the young master at the terrace a while ago.
Eruhaben: As I said, you can't put Cale inside the box.
Raon, On, Hong, CH, and 99 others, either sad or angry: We can't?
Eruhaben: Fine, we can put Cale in the box.
Eruhaben, in his mind: I want to put him in there anyways.
Cale, eating grapes while photosynthesizing: I suddenly had chills, is someone talking shit about me?