Many of the HC and backstory I've been giving is on the kaiju/Terran side, understandable given that it's the side out of this crossover that has deviated the most from the source material whereas the Equestrian side I've tried to keep as close to canon as possible. Most of the differences is due to me having to come up with stuff for plot that conflicted with canon that came out after I wrote it and I couldn't work it back in (i.e. most of Sombra's earliest years on account of FIENDship is