I know several people have created and use redefined
fonts and characters. Here's one of my examples

http://home.clear.net.nz/pages/joecolquitt/odometer.html

(not totally MPLAB-friendly asm but the hex is). An early
version of an odometer-style counter

Characters with a code > 07 come from the LCD's ROM, and
those 00 to 07 ( = CG) are made up of RAM data

At line "new8", the character address is set to 00 (as this
program uses just the first redefinable character)

8 bytes of character-forming data are got from the PIC's memory
and downloaded to the LCD's memory for character 00. Changing
the RAM data in the CG section of memory can be done at any
time, so you can create animations, as this example does. The
number on the far right which scrolls over and over is always
CG 00 - it just has its shape changed

As for any other character in the LCD, when the code for a
redefinable one is sent, it is displayed

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