Ahh, thank you so much! I wanted to base Avery of the Patupaiarehe, who are thought to be the Maori equivalent of the Fair Folk as well as more traditional fairy creatures, meaning I could make some fun design choices! Also, one of my favourite sub-tropes of the' Mad Scientist' archetype is the idea of going against nature and duality in general (think Jekyll and Hyde) so they were both things I wanted to put my own twist on haha.  As for the backstory, you got it spot on, I wanted to keep it a little vague and with some questions unanswered so if I do eventually use Avery in a story there will still be some mystery!