You might be happy with a Kobo ereader. It fits many of your needs.
You can choose your own font and adding new fonts is simply a matter of copying them to the device.
You can set the light level to 0.
Out of the box, it will display the book cover as the screen saver. Personally, I use a set of random images (mostly M. C. Escher).
Not sure what you mean by less of the screen? Do you want to set very wide margins to reduce the amount of text on the screen?
Kobos have a wide font size settings from flyspeck to do you really want 3 letters on the screen?
If you use kepub format (Kobo's proprietary modification to epub which mostly adds a mass of spans for locating text), you have the option to zoom images. Kobo's have two renderers, one is an older Adobe RMSDK for compatibility with Adobe DRM such as library loans, the other is WebKit based and has much better ePub3 compatibility as when reading ePub3 fixed layout ebooks.
Not sure what you mean by right justification? I suspect it is what I call fully justified text which has equal left/right margins. My personal preference is left justified/ragged right. You can set justification to off, left and full.
My daughter uses her Kobo for reading manga and seems happy enough.
Newer Kobos are water protected (HZO conformal coated electronics).
Also note that IMNSHO, Kobo ereaders and calibre are that proverbial marriage made in heaven.
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