The big thing is that unlike the Madoka series, there are lots of other people who might be able to detect that a Witch is active, and have the power to do something about it. This makes the life cycle of Witches (trying not to spoil too much) difficult to sustain. I mean, sure the Spider could not take any decently powerful Witch down by himself, but you have people like Percy Jackson and Harry Dresden who are much better equipped for that sort of thing.
I disagree- witches would be quite easy to fit in with the setting purely because of their secretive nature. It requires magic to open a door into those barriers and though quite a lot of people have magic, not all of them are equipped to open barriers.
Anyway, most of them would probably fight their way out of a barrier instead of killing the witch because lets be honest- who the hell would know what hit them when those butterflies start flying with the cotton bud rose-men?
Also, I wanted Magical girls them selves to be relatively new to this city, as in this city in particular, not to say there aren't magical girls at all.
edited 15th Dec '13 7:39:28 PM by biomechtraveler

My character would be pretty hard for SHIELD to find.
He is a shape-shifter after all.
what do you mean I didn't win, I ate more wet t-shirts than anyone else