Born on Earth in 2353, Ilario came from a big family, having had three brothers and two sisters. Ilario attended Starfleet Academy and was a member of the graduating Class of 2372. In mid-2375, Ilario was assigned to Deep Space 9, where he quickly grew to admire his fellow officers, especially of Doctor Julian Bashir and Chief Miles O'Brien. Likewise, Ilario was well liked by the crew, and was notably observed by Ezri Dax to be intelligent, dedicated, and eager to please.