The E6-00 is based on the Symbian operating system.
On Symbian you can install and override default/system fonts, if you wish (and have compatible font files).
Here's an old blog article describing the process:
Install the new fonts on the memory card; restoring the phone is easier, if you can just pull out the memory card.
Add a Unicode font that has both English and Kannada characters. A Unicode font can have characters for, more or less, all the languages in the world (living or dead) in a single font file.