John Constantine

A blond-haired man  who wore a beige trenchcoat drank his sixteenth pint of Guinness at a bar in Dublin on 31 December 1999. He dismissed the sensations of a psychic maelstrom emanating from London on the pints. (PROSE: Millennial Rites)

Behind the scenes
While not explicitly named, the man is John Constantine from Alan Moore's The Saga of Swamp Thing comic series by DC Comics.