He/Him
I’m not really adding to the conversation with this but wanted to share anyway:
I personally use Zathura, it’s minimalistic and uses VIM bindings.
But if you want something feature-dense, with a way of organising your library, eReader integration, file converting and more, Calibre is pretty amazing (and the actual reader part of Calibre is quite nice to use in my opinion).
Kanary definitely looks good - although they are US only at the moment (rules it out for me unfortunately). Thanks for your insight!