thanks for the feedback. almost all of the Latin extended and quite a reasonable subset of Unicode is covered. the word "naïve", for example, renders perfectly because the "i with diaeresis" is present in Myna. if you find any which are not covered and want them added, please create a feature request. about the fallback font, you can use any monospace font you like. i don't use any fallback generally because i work almost exclusively in the ASCII range in the editor.