Vrestin

Vrestin was the leader of the Menoptera expedition tasked with clearing the way for the Menoptera spearhead to free Vortis from the Animus.

Accounts conflicted on whether they were male (PROSE: Doctor Who and the Zarbi) or female. At any rate, wen Hrhoonda was killed and Hrostar captured, Vrestin fled and met Ian Chesterton, whom Vrestin became friends with. Vrestin and Ian fell underground and met the Optera. When Ian convinced the Optera that Vrestin was a god, Hetra, their leader, and three other Optera went with them to find the Animus.

When Barbara Wright destroyed the Animus, Vrestin welcomed the main force to Vortis. (TV: The Web Planet)

Behind the scenes
In the novelisation of The Web Planet, Vrestin is male.