Hotel Denouement Fire (possibly)
Mr. Lesko is an antagonistic citizen of the Village of Fowl Devotees. He is very rude towards the Baudelaire orphans and goes as far as to suggest burning them at the stake, as he believes that they had killed Count Olaf.
He returns in The Penultimate Peril but it is unknown whether he survived the fire that destroyed the Hotel Denouement. During the trail Of the Baudelaires and Count Olaf, he hands in rulebooks for evidence. He does not know anything about the organization V.F.D.