YOu may want to take a look at Transparent Window Manager". http://www.oreware.com/viewprogram.php?prog=10/
It allows you to set some options to specific windows/applications such as transparency, always on top, always at the bottom, disable input, minimize to tray, etc.
It's free to try, $20 to buy.
NOthing about custom fonts though, but it would take care of the transparency issue.