Curate, connect, and discover
Not that he notices. His body absorbs ectoplasm from the portal, with the ectoplasm preserving it. Each time he leaves his body, it absorbs more. No one, not even Danny has realized.
His parents find out after they see him leave his body behind to fight a ghost and promptly dips, flying off in panic with his body. He heads to one place with... definitely smaller amounts of ectoplasm, but enough to possibly survive.
Gotham.
Danny, in a rush, didn't have time to pick up the backpack meant for this scenario. He (thankfully) had some ectoplasm in his thermos, but it's not nearly enough long-term.
After running out of ectoplasm for a few days, Danny starts to feel off.
Danny's skin feels tight. His body is a lot stiffer than he recalls, and he can't seem to get rid of this awful smell on him. His face and hands are slowly discoloring, fuck, what the hell is going on?
His emotions and core are going haywire from the disapproval of his parents, perceiving anyone as a threat.
He temporarily haunts an alleyway, refusing and growling at anyone who enters his haunt. His eyes flash with that sickening green color. He can't afford to get hurt with the limited ectoplasm he has.
.
Unfortunately for Danny, it was the alleyway where the Waynes were murdered.
And the Bats are protective of it too.