We’ve always hook Spike up with the Mane Six and/or anyone else within the MLP franchise.

But what about characters from other franchises? Like Ariel and her sisters from The Little Mermaid, the female cast of Shantae, or even pop idol groups and female agents from Splatoon?

Just something to think about.

I don't think it's a matter of which franchise/characters, but HOW to join the franchises/universes... some are easier than others, like most human/human-like ones through EQG, and ones with dimension hopping like R&M or Helluva Boss can have them just appear because reasons...

then again, could just say screw it and just want to have the two characters/universes together for no reason, just not gonna ask questions about how/why

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I'm doing a crossover of MLP Gen 4 with DC superhero girls Gen 2 where Spike is on an ambassador mission to the DC Earth.