Vena: I've actually seen some fan art that had Kagura as done up as Bowser.
On a more serious note, I was trying to make a narrower point. In terms of backstory and "identity" Amata seems more wide open and Kagura seems more constrained. In terms of character development I think Kagura has more room than Amata ("nowhere to go but up?").
Time will tell if there's anything to my "sick of reincarnation/lovers suicide(?)" idea for Kagura (...and Mikono?). I came up with it when I realized the simplest explanation for a wedding in mourning clothes would be if it was a wedding that was going to become a funeral,
, and it definitely seems like that angle *could* explain a fair amount of nagging little things about Kagura (and Mikono, and Mykage, etc.).
You make a good point about how much Amata and Kagura are mirror images of each other, a bit more than I thought. Both Mikono-obsessed, both being groomed by mysterious entities, both apparently quasi-orphans...