In general, 'the + adjective' and 'the + past participle' could be used instead of a plural noun phrase.
The good die young.
The damned will bury the dead.
I think in certain cases that structure could be used instead of a singular noun.
'The Good, The Bad and the Ugly'
I was not the hunter but the hunted. (the hunted one)
Also, the structure is sometimes used with a possessive or an indefinite article instead of 'the'.
- Is this structure is ever used for non-humans?
- Is it ever used for non-living things?
- Is it ever used with a determiner other than 'the' when we don't have a past participle, but an adjective?