Characters without names.

[Yarglenurp]

Fight Club comes to mind.

And, taking a hard turn in another direction, Jim Carrey's character in The Cable Guy.

His name was Robert Paulson

 

[THBGato]

Curley's wife from "Of Mice and Men'.

Have you ever read Steinbeck's story "The Chrysanthemums"? It's kind of the flip of "Of Mice and Men" in this respect, as the rancher's wife is given a name (Elisa Allen) but the migrant tinker she interacts with is left unnamed.

 

[OffNSFW]

Wasn't there also some apocalyptic movie from the 80s where the main tough guy character was unnamed and only credited at the end as Nada?

John Carpenter's They Live, with Roddy Piper as, well, the guy from They Live.

If anyone hasn't seen it, it's the one with the sunglasses that reveal the authoritarian messages behind advertising and television broadcasts.

 

[TadOverdon]