I'm working on a multi-crossover fanfiction. And I don't know how to start., but I've got some of the setting in general kind of sorted out.

Most of the franchises that I'm planning to use are from the same dimensions For example, the Marvel universe I'm going to use will also have characters and elements from the Dresden Files, DC, Hellsing, Chainsaw man, Jujutsu Kaisen, TMNT and Godzilla, and another dimension is a fusion of Type Moon, SCP Foundation, Tokyo Ghoul, Gravity Falls and a few more.

And some dimensions are the same like Warhammer 40,000.

So basically there's the Multiverse, which is has the higher planes and lower planes, with the universes in the middle (basically classic D&D cosmology. A prophecy emerges, telling of a series of world-shaking events across multiple dimensions and a war of biblical proportions, causing factions and entities from dimensions above and below in a scramble to prepare themselves for the coming war.

An entity from a higher dimension reaches out and selects souls from an Earth where other worlds and possible futures have manifested fiction for some bizarre reason. They split the souls into two groups, the first are basically heavily nerfed ROBs (they're more like Eternals from Marvel), and the second are un-killable super-soldiers known as Huntsmen that are WAY more unstable than the first group. And there's an unspecified third group thats straight up terrifying and are based off a being known only as the God-Hunter.

An OC wakes up as half Huntsmen, half ROB, in the dimension that the Huntsmen and the Diet ROBs are using as a base (they are actually living in the proverbial basement of an inter-dimensional empire of feathered saurians, who tolerate them the way you tolerate a group of Deadpool knock-offs and reality warpers in your basement.

The dimension in question is called the Mare Stellorum, and occasionally rifts open and individuals from other universes sometimes appear, and the OC has to work with a group of Huntsmen and characters from other dimensions to deal with a series of incidents and threats such as Mechs destroying property and the odd attempted invasion.

 
I think if your main appeal is having all your crossover cast together and bouncing off one another, you should limit your originals a bit so you don't spread the focus too thin. You could probably also just focus on developing your original plot and character arcs for your protags and using the crossover elements to support it.

Basically identify what your scope is, what you want to focus on early. Otherwise you'll have loads and loads of moving parts.
 
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