For Manga/Comics/Webtoons/Etc.:
Tachidesk on desktop
Tachiyomi on mobile.
These are both fantastic and allow you to grab manga, comics, etc. from pretty much every site you can think of to have it all in one place.

For Movies/TV/Anime:
Kodi + Debrid + Arctic Horizon 2/TMDbHelper + Fen + Otaku (resources: 1, 2; screenshots: album)
I love this. I can watch literally anything I want as if it was a netflix-like service, and don't have to use a VPN. Can even throw this on a shield/chromecast/firestick.

edit: tachidesk doesn't have a fit-to-page feature, but you can just use stylus with this:
img{
height:100vh !important; /* fit height of screen */
min-width:0 !important; /* also needed for fit height */
}
edit 2: Also, not really piracy per se, but Syncplay is great for watching downloaded content with friends.