The (possibly?) gay couple that Hamlet is friends with in the play of the same name.
They are duped by Claudius into escorting Hamlet to England to be killed, but Hamlet escapes. Rosencrantz and Guildenstern then unwittingly meet the English King, and and hand him a letter instructing him to kill them both. They die. Nobody cares.
In the play, they always appear together, and seem to be entirely co-dependent. They have no real
individual traits.
Despite the fact that they are fairly minor characters, they have a sort of cult status. Tom Stoppard wrote a famous play called "Rosencrantz and Guildenstern Are Dead", which tells
the story of Hamlet from their
perspective.
Rosencrantz and Guildenstern in Hamlet...
GUILDENSTERN
Which dreams indeed are
ambition, for the very
substance of the ambition is merely
the shadow of a dream.
HAMLET
A dream itself is like a shadow.
ROSENCRANTZ
Truly, and I hold ambition of so airy and light a quality that it is but a shadow's shadow.