- Ghost World
- Persepolis
- Maus
- Scott Pilgrim (on the longer side but compared to the others, there’s 6 books but individually aren’t too long)
- Invincible (also on the longer side but is complete, there’s three “compendiums” that contain the 144 issues)
- Road to Perdition
- Old Boy (actually a manga)
- Le Transperceneige/Snowpiercer
- Blue is the Warmest Color
- Ichi the Killer (manga)
- A History of Violence
- The Adventures of Tintin
- The Fountain
- The Empty Man
- Any Junji Ito
I don’t think anyone has suggested these yet, but if you like Batman stuff these are good standalone tpbs
- The Long Halloween
- The Black Mirror
- Batman Eternal vol 1-3
- Hush
- The Court of Owls + The City of Owls
- Gotham Central omnibus
Not Batman, but hard boiled is The Good Asian, there’s a new edition of it in one volume
Battle Angel Alita, Viz Publishing, 9 volumes
Department of truth!
If you happen to read Battle Angel Alita and liked it there is also a sequel series Battle Angel Alita: Last Order which is also awesome.
A few other favorite mangas:
20th Century Boys
Claymore
Gantz
Blame!
Happiness
Dark Tower. It’s a Stephen King adaptation. Not super faithful to the book series, but just as entertaining. And it is NOT the movie! The movie blows and you should avoid it. But read the books and the omnibus.