Gemma becomes a double--triple agent.
The Frillish believes she is going to shut down the Gosidonia interdimensional travel plans.
The Gosidonians believe Gemma is working to make interdimensional travel work 9they are almost at the breakthrough point, and they need to keep the Frillin's from sabotaging their work again).
Gemma is actually working for her own goal: getting herself and Nellie home, and then barring the way behind her so that interdimensional travel doesn’t become widely available (and then interdimensional war and tragedy can't happen).
Kevin tearfully says goodbye to Gemma after betraying the Frillish people for her.
Fiona tries to get him out of trouble and succeeds in lesseninghis punishment.
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Gemma manages to accomplish her goal, even though she leaves friends she made behind and even semi betrays some of them.
Skyler stays behind (he wanted to) also with his Furrier class he makes Gemma an epic coat at one point that protects her and Nellie from damage. Skyler becomes a legendary Lost for his business acumen and battle prowess when a monster crahes through dimensions and wrecks havoc.
Gemma takes Nellie home (it’s been ~1 year since tey got transported, and Nellie has gotten bigger) but realizes she can’t acclimate to Earth life at that point, especially with al she's been through. She briefly meets with Mia and they have a reunion, and then a sad goodbye.
Gemma returns to the Void between dimensions and loses her Babysitter Class, and gains the Class, Singer of the Voids. Guardian of the Void allows her to keep the dimensions from meeting but allows her to visit dimensions too (didn’t decide on all the details) prob take home the Lost that want to go home.
Gemma would also join a band/make her own kinda thing at some point. Probabaly the band Hello Goodbye.
I may have missed some details, but that was the gist of where things were headed.
Thank you all for your support, and I hope to one day finish this project or start (and complete!) a new one.