When the Arkham rogues find out Danny has ghost like powers they would have mixed reactions.
And they would be worse because Danny never even told any of the rogues he regularly hangs out with that he was a meta in hiding until he had to use his powers one day in self defense during an inmate riot.
On one hand, they could ABSOLUTELY use this to their advantage when it comes to destroying or taking over Gotham. Danny has it all in the terms of villain like powers, intangibility, invisibility, UNKILLABLE??
Bro is a WALKING unit and doesn't even care to let people know or care himself. He just walks around like he isn't an absolute force of power.
On the other hand, he's so odd that it just makes them NOT wanna touch that shit with a 10 foot pole. Like he just, acts like he's genuinely forgotten that he isn't undead/undying sometimes and its unnerving. It makes the more scientist side of the rogues wanna study him like a bug under a cup.
They just kinda are concerned for him, as his genuine kinda friends kinda neighbors, but also poking and prodding how to recreate these powers for themselves.
It was already a game of cat and mouse between them on who gets to keep Danny around them for their evil schemes due to his chaotic problem solving but now with the ghost powers, he's accidentally attracted the even worse rogues who didn't have any real interest in his existence until then. People like Penguin and Rupert Thorne
This doesn't help the staff either who now have to keep an even BIGGER eye on the freak scientist kid who turns out is a meta who could escape at any moment and AGAIN just chooses not to?? He's so fuckin weird and every guard that interacts with him genuinely hates having to do it lmaooo
Bane once tried to force him through blackmail/physical harm to use his ghost powers for his own escape and Danny just grinned at him eerily before he was suddenly absorbed into Banes body.
When Danny came back out, Bane took one look and started screeching before backing away and locking himself into one of the empty cells. Nobody even knows fully what happened and Bane refused to talk about it.
Needless to say, nobody fucking tries to make Danny do anything after that and just try to convince him to join their causes instead through bribes.