So. Idk how many people are familiar with Transformers Prime but the shadow dimension is a mirror of the real world but in muted colors and people in the shadow dimension can see and hear people from the original dimension, however, people in the regular dimension cannot see/hear/feel/etc. anything from the shadow dimension.

I like that idea but instead of it being the shadow dimension being a mirror it’s a copy of DP’s world and instead of a one way type of perception the dp and dc dimensions remain separate… kinda.

Amity absorbs parts of Gotham and makes a shadowy copy of various places. The citizens of Amity are like, “Well. There’s a new park/office building/street/etc. I guess.” 

Gotham, meanwhile, remains the same. Physically.

Sometimes people will appear in Gotham, walking, sitting in the park, etc. But they never acknowledge anyone and can disappear between one blink and the next. If there happen to be two and they speak to each other, it sounds like static. No one can’t touch them- Gothamites go through them. These ‘shades’ are Amity people in the Gotham areas that have a shadowy duplicate in Amity. None of the Amity people are aware this is happening. 

I imagine the Gotham side of things dubs the Amity people shades ghosts XD

Anyway, on the Amity side a major ghost fight has to happen in one of the Gotham sections and so the Amity people run. Some are screaming, all are frantically trying to get away. One problem though- Ghost Zone ghosts don’t render on the Gotham side. So the Gothamites don’t see Phantom nor whoever he was fighting.

So now the Bats are desperately trying to figure out what could have spooked all the ‘ghosts’ (Amity shades) so badly because, I mean, it’s Gotham. It’s going to pop up again and bite them, right? 

I figure Gothamites can get into Amity too. If one of them passes a threshold from an area of overlap where Gotham exists in the shadow zone then they can step into Amity, however no one from Amity can see them and no one can hear them. If they get back to a place of overlap they’ll end up back in Gotham.

Maybe overtime the merging gets better/worse and things start interacting more. Roads appear and disappear on either side. Buildings clipping in and out of reality, the Amity shades being able to interact with Gotham by like tripping on things that exist in Gotham but not Amity, the Amity people seeing items move that Gothamites are moving around in their dimension, etc. I don’t know. But listen.

The court of owls needs to have one of their 13th floor shindigs and just. Amity shades everywhere. They take over all the 13th floors, making the owl associates terrified because why are all these ‘ghosts’ suddenly haunting notoriously cursed floors?? They begin to believe their own stories. Bonus if the Amity people take the coffee and that’s the only thing they can interact with from the Gotham side 13th floors so now the owl court is supplying the ‘ghosts’ coffee so they can still use the 13th floors as their meeting places in ‘exchange’. The coffee offerings are appeasement. Meanwhile Amity side people are convinced there’s a coffee ghost somewhere because these brands don’t actually exist and where else is it coming from?

The Nasty Burger and Bat Burger could overlap. Someone walks into Nasty Burger and orders Nightwings. Someone at Bat Burger walks up and asks for Nasty Sauce.