Looks good to me, although the GEAR wouldn't be able to be equipped with a flight unit at this stage of the game, as that tech isn't fully developed (our 1x1 takes place in a slightly off-center version of the universe, where the tech is a bit more advanced). Otherwise Chris looks good, as does the Sovereign. 
Although, I would advise editing your systems and equipment for your 'thermal cameo system' ;-) 

In terms of introducing her, my recommendation would be that, if it's okay with yourself and if Aristo is okay with it too, we just drop you into ASTA's position, and just pretend you were with us all along, and are backing up Myrina. It saves having to do any plot gymnastics to introduce you, or to explain where he's gone and killing him off too. 

I'll add the CS to the OP later on.