Nesbin

Nesbin was the leader of a group of Outsiders which included Presta, Ablif, and Jasko. It was his group who discovered Leela and Rodan after they had left the Capitol. Together, they organised an attack on the Capitol to fight off the invading Sontarans. (DW: The Invasion of Time)

After Andred's apparent death, Leela decided to leave the Capitol and join the Outsiders. An elderly leader of the tribe began her initiation and told her she had changed during her years in the Citadel. This may have been Nesbin. (BFA: Weapon of Choice)