You might want to use File > Export Bitmap (which actually saves as .png by default) when you save your banner in Inkscape, half-halfling; that way the white around the characters and words isn't saved. As it is, look what happens when I quote one of your banners:
In contrast to others:
(More info here.)
That said, good banner. It lacks a red, stick-figure-hand-shaped mark on Belkar's face though...