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Core Fusion AU
The people that live in the Infinite Realms are able to fuse like gems in Steven Universe. Why you may ask? It's because their body is made up of ectoplasm that comes from their core, which is very similar to how a gem's form is made up of light and comes from their gem itself.
Fusions occur when two or more ghosts share a similar strong emotion or obsession, such as protection, love or hate. The fusion is a state where the occupants share thoughts and work together to operate a single body, so a lot of trust needs to be present or a singular goal in both minds.
Core Fusions also merge unique powers together to strengthen or link them together more.
Due to this, core fusions are typically seen as a way to show trust in any form or bond between ghosts, and as a way to strengthen forces and power.
Danny is probably able to fuse with ghosts and humans but was never told that it was possible for him bc he's half-human.
Now, this could work for both Dp x Dc and Dp x BNHA.
Dp x Dc
Danny can fuse with people who have been touched by death or have been dead and came back (like Jason).
The fusion would be a physical form that mixes both or more appearances while their cores (pseudo or not) appear as jewellery they wear as the fusion, which changes depending on the fusion.
Since I'm fixated on the dead on main ship right now, let's say that Jason is the one to core fuse with Danny first, and there can be an in depth backstory on how they meet and leads up to the core fusion, and it helps with the pit rage. Danny takes them to either Frostbite or Clockwork to figure out what is going on and they learn about core fusion and how it works.
-possible plot idea ahead-
In Gotham, Red Hood has been MIA for several months from both being a vigilante and a crime boas, and the rest of the batfam are freaking out about it; especially since a new crime boss has come into play going by "The Monarch" or "JD Fent" (The Monarch plays into Danny being either Ghost King or an adjacent role in the Infinite realms, and the JD Fent is a mix of their names bc I think it's cool :D).
Meanwhile, Jason and Danny have been chilling together using core fusion to keep away from the batfam and have been improving Crime Alley with Danny's inherited chaotic mad scientist gene being used to harness ectoplasm as a renewable energy since Gotham has a large quantity of it (bonus points if the ectoplasm can be re-filtered to be safely used again for power).
The GIW or another ghost could show up in Gotham to hunt down JD and the batfam accidentally get captured since a lot of them have died (I think??).
Cue a garnet-style reunion and a "stronger than you" scene before escaping and telling the rest of the batfam the truth.
Dp x BNHA
Similar to the other one, but quirks count as mini-cores and that's how people gain their powers. Quirkless people don't have cores and therefore don't have powers.
Danny could be able to fuse with the previous OFA users and just pull them out of Izuku or they could just fuse by Danny grabbing onto Izuku when using his quirk in a fight.
And I'm just imagining during one of the fights Danny grabs onto Izuku and a flash of light shoots out and once the light clears, Danny is gone and a person with three sets of arms with an appearance similar to Danny's and the other OFA users mixed into one before battling it out with the LOV.
Please let me know if anything doesn't seem like it works! And this prompt is free to use by anyone if they want to! :]