Many of the Saints taught that the Antichrist is a particular person.
The Virgin Mary at La Salette taught that the Antichrist is a particular person.
Pope Benedict XVI: āThe continuation of this text announces that before the Lordās arrival there will be apostasy, and one well-described as the āman of lawlessnessā, āthe son of perditionā (2: 3) must be revealed, who tradition would come to call the Antichrist.ā
[General Audience, 12 November 2008]
Scripture describes the Antichrist as one particular man, the man of lawlessness, the son of perdition.