Maybe I've missed this in the last 24 pages, but with the exception of Japanese text fbreader covers every bit of functionality I find in other applications, including browsing Calibre libraries and TTS if you install those add-ons.
I actually came to this site looking for information regarding CJK language handling via TeX or more complex xhtml in epub and am fairly disappointed in the concentration on so many applications that (admittedly in my opinion) are either terrible or simply methods of increasing sales as a store front end.
For a less confrontational addition to this thread I submit a simple, free application that supports aozora bunko formatted text under android, though with some limitations:
https://play.google.com/store/apps/d...xtViewer&hl=en