En-Threelo was a droid who served the Fylari of Ontotho. After the Fylari rescued Jedi Padawan Cere Junda, Neralli had En-Threelo watch over her. When Junda went to Ontotho City in an attempt to make contact with the Galactic Republic, En-Threelo accompanied the Padawan to keep watch over her. Junda was confronted by the security forces of the Daa Corporation, and she sent En-Threelo back to warn Neralli.