Is there drawChar() api function smiley-wink
Good point. It does not exist on the Arduino C++ interface, but it is there on the C-level interface. It should be added.
The other tricky thing is that the font either needs to be a fixed width
or the variable width characters need to be rendered centered
within a fixed width.
Additionally the are two different "a" out there.
Reference to Wikipedia (http://en.wikipedia.org/wiki/A
I am not sure, why there is a need to overstrike two glyphs. I would expect, that all common glyphs are inside unifont.