Danny’s parents don’t take the reveal well. They promise to hunt down phantom and and fix there baby boy. The king Phantom must be possessing Danny. He must be after information on the mortal realm to take it over.
This leads to Danny on the run.
Now he has access to the resources of the realm. He also never tells anyone he left amity because his parents were hunting him down. He just told them he wanted to travel like Ellie.
He earns money and whatnot by selling extinct or near extinct ingredients. Stuff used for spells and other hard to find items. Ghost in the realm are happy enough to tell him where they hid there stashes and the realms plant life is all extinct plants. Those that died out.
This leads to him meeting Zatana and other magic heros (if they have a bad vibe he won’t sell to them). He avoids John. He’s received numerous warnings about the soul seller.
He is in the middle of a transaction when Jack and Maddie locate him. They then proceeded to capture him all while screaming about “fixing” him.
Danny shockingly enough had been concealing his identity. They didn’t need to know he was only 15. And of course he was wearing a device to hide his ecto signature.
During jack and Maddie’s attack. Both his disguise and device are ruined.
Now the magic user knows Danny is at least a partly human child and the king of the infinite realm. Who is being attacked.