I wanted to smack her for a while. Thankfully I got to see the series all at once, because we got to see her motivations, which made me be able to understand her a bit more. Honestly, I wish she had been around more so we could see more development and I could get a better feel for her character. She's probably my least favorite of the magical girls.

Sayaka!

Mami. I have no idea why, but I think they would balance each other out well.

I don't know the fandom well enough to have a popular character. XD

Other than maybe some more screen time, nothing comes to mind...

For some reason, Kyoko has a very strong sense of god and faith in my head (though not necessarily a particular type). Maybe it's just how she talks in that final scene. *shrugs*