There already exists an old post that ripped sprites from previous version of this game:
http://mugenguild.com/forum/topics/the-king-of-fighters-destiny-android-graphics-rip-182817.0.html
These sprites are encoded into dt0 format, but the poster was able to decode these dt0 files into etc1 files then converted them into png images.

However as the game updates, new sprites emerge and those are also encoded. I tried using ultraedit to convert the dt0 files, but since I have no sample of any etc1 file, the attempt was not successful.

An example of new enemy sprites was provided below:
https://www106.zippyshare.com/v/DdonjQGV/file.html

There are just a few of them, and I have only looked new content in monster(enemy) folder so far. The original post has another updated dt0 files as well:
https://drive.google.com/file/d/1OWiP0CeIy_nwsOGkOCSZ8CjtoE8KaP9c/view?usp=sharing
https://drive.google.com/open?id=1oi6SRfhMEtR0C31643kgO6y6NM0y2IyY

Thanks!