Imagine a gem AU where the crystal gems are the turtles we know. They end up living through steven universe movie where everyone expectorant for mikey gets poofed. So it's up to MIKEY to find a way to make them remember who they are.

Meanwhile Leo's Pearl in the au, Ralph is garnet and Donnie is amethyst. As for the gem b team, Mona Lisa is lapis, the peridot in this AU is Jennika and slash is Bismuth.

As for who spinel is, I was thinking it's Venus de Milo, who technically has been abandoned by the tmnt tv how series as well as comics.