So would something like creating Pokemon from Star Wars be a good idea? If it is, nobody copy it.
Here's every character I can think of: Luke, Anakin/Vader, Obi-Wan, Leia, Han, Chewie, R2-D2, 3PO, The Senate/Palpatine, Darth Maul, and the one played by Samuel L. Jackson. And you can really compress that to Jedi, Sith, Droid, Person with Blaster, and Chewbacca, because the overlap is immense.
Honestly, limiting these mods to a single series is a
terrible idea. You rapidly run out of interesting characters, and there's a huge guarantee that exactly 2 people are familiar with any character that isn't massively iconic. In fact, the first half of Crossover Chaos v1 shows exactly what happens when the Pet Mods community deals with characters they don't really know - complete idiocy. Even when you eliminate these issues, you'll likely have to stretch things a LOT to maintain proper type diversity, since most series are going to either hover around or exclude a few types
coughcoughtouhoumoncoughcoughicetypeyumemicoughcough. In order to make a decent mod of this type, you need to do the same thing Crossover Chaos v2 did - cover an entire medium rather than a single series, with people free to submit whatever character they can think of. Even if you cover a whole medium, you need to have open slates to get a decent mod - Best case, you a huge mess like CrossChaos v1's first half, and worst case, you get the No Activity of Pokécomics.
It could be interesting, but it does seem similar to Crossover Chaos and we just got a new film/TV-related tie-in mod, Tennysonmons.
Tennysonmons is going to crash and burn around as hard as Pokécomics did so honestly who cares