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Danny is sent to Gotham and is Stuck in his Spirit Animal form (as a forced vacation by clockwork) which happens to be a little white bat. As he’s King his animal form reflects that, he has glowing eyes, the underside of his wings look like a nebula, when he flies frost or stardust trail behind him, when he ‘echoes’ its an Aurora.
So, we come to this. Danny stuck in bat form adopted by the local bats who think he’s their ‘Goddess’ Nocturna child. (If you ever seen the animated cartoon/movie Silverwing).
So they take care of him and he grows up in their care for years and is just honestly having a blast. The Ecto in Gotham makes him grow very,very,very BIG
One day the Other bats(*cough*Damian and Alfred*cough*) decide to just check on there local namesake and make sure they’re Healthy and come face to face with what they assume is the bats *Mother*
I just headcanon that due to Danny and the fact he’s leaking ecto the bat colony are smarter and faster than normal bats.