Ventu was a Vahni Vahltupali who lived in the 24th century and worked for his planet's government on one of the councils given over to the affairs of state.
In June of the year 2376, as part of his council's jurisdiction in establishing relations with off-worlders, Ventu made first contact with the Federation starship USS Defiant.
He acted as Commander Elias Vaughn's guide during the Defiant crew's visit, and presented him with a hologram of the city when the Starfleet officer announced that they would be departing.
Unfortunately, Ventu was killed in a powerful earthquake, despite Vaughn's efforts to save him. (DS9 - Mission Gamma novel: Twilight)