avy can be easily used with non-Latin languages. You're currently reading target char like this: (read-char "char: "), just add optional argument inherit-input-method and people will be able to use avy to navigate any sort of text: (read-char "char: " t). I don't know any reason why current input should not be taken into account. Users who are not interested in non-Latin languages usually don't enable input methods, so they won't notice any changes, however if you have activated some input method, changes are that you're editing text that consists of characters the input method provides. So, I think this change would be good from all points of view. What do you think?