The phrase "a peculiar role" is correct and usable in written English.
It can be used to describe a unique or unusual position or function that someone or something has in a particular context.
Example: "In the play, the character of the jester serves a peculiar role, providing both comic relief and profound insights."
Alternatives: "an unusual role" or "a distinctive role".
San Marino operated with a five-man defence but all four midfielders played in their own half, too, and their striker, Andy Selva, had a peculiar role.
WASHINGTON — In a peculiar role reversal, Republican lawmakers are mounting a ferocious attack on the Republican chairman of the Federal Reserve, while Democrats are coming to his defense.
One other tension, unforeseen in 1990, complicated the writing of Beliefs but at times gave it a peculiar role and energy.
The American soldiers who help Iraqi border guards patrol the Iranian frontier in this hot, dusty no man's land find themselves in a peculiar role.
The page turner escaped without injury after her classical stage dive, a rare occasion on which a peculiar role in musical performance became the focus of attention.
Among these reactors, a peculiar role is played by the Molten Salt Reactor (MSR), which is the only one with a liquid and circulating fuel.
"Bright Shiny Morning" is about Los Angeles, a city whose peculiar role in modern American literature is to function not just as a setting but a character.
Of course, the statement was composed in a rush, under the pressure of events, but it was a reminder of how far from equilibrium Facebook remains in understanding and managing its peculiar role as a near-monopolistic, for-profit public square, as well as a peoples' broadcaster and news distributor.
Mr. Garner reveled in his peculiar role as a police stooge and designated witness for the prosecution.
Shaw has a peculiar dual role.
According to the results of structure analysis by means of MALDI-TOF mass spectrometry, UV vis spectroscopy, and 1H NMR spectroscopy, DPE is incorporated in the copolymer chain exclusively as a reactive recombinant α,p-dimer, underlining the peculiar role of DPE in radical polymerizations.
