Oh, man I was actually considering making a thread about this interesting character of Tumblr history, but someone beat me to it.
The obsession with making Sayaka trans is some hardcore projection, even though there's nothing in Madoka that even slightly hints she's anything but a cis girl. Sayaka is a pretty good example of everything IDCP isn't though. Brave, means well, self-sacrificing, genuinely wants to help others...
Though one thing I've always wondered is if she's really trans at all. It's hard for me to believe that any genuinely dysphoric trans woman would spend ALL their time picking on other trans people and making their own gender a massive clusterfuck. Especially since she says dysphoria doesn't real. And there are people on Tumblr that do the "I'm a trans woman stuck in a female body!" thing. Her selfie also doesn't look very masculine, either. Just like your average fat girl. But then again, even trans people can be assholes, and she may have been on HRT for a while.
Truly trans or not, she's an idiot either way.