Zachary Manzanillo was a male Human from Cestus III. He had an olive complexion with curly blond hair and a red goatee.

Manzanillo served as assistant to Esperanza Piniero beginning in 2376, when she worked on the staff of Cestus III Governor Nanietta Bacco, and continuing after Bacco was elected President of the United Federation of Planets in 2379, and Piniero became her chief of staff. (ST novels: Articles of the Federation, A Singular Destiny)