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A little bit about Guilt Girl's costume; she likes (skanky?) black leather (but money is tight so her costume is usually a second-hand, sales-rack, pieced-together, self-altered affair) and she wears a surgical mask (the easiest cheapest identity-obscuring thing available to her).
And she wears a black strap wrapped around her left arm.
A little about that black strap...
I've always thought that a black strap wound around one's arm would just be a cool touch to a costume, so obviously Guilt Girl would wear something like that just for the design appeal (in spite of money problems, she does like a bit of flair.)
Then, I'm working on a character who lives in a phylactery. When I finally got around to doing some research on phylacteries (or tefillin) I was enthralled and amazed to see what they look like when worn. The feminist in me was delighted to see the gender aspect of this ritual dress addressed by Barbie and even Rosie the Riveter.
So I am toying with the idea of her little black strappy costume thingy having a strong aspect of tefillin to it.
But I'm not Jewish, and I don't think Guilt Girl will be either. So... working on it. And hoping it won't be perceived as too offending to any members of the Jewish community who might happen across her.