Rila is a young Aquan woman of Argo in The Ambergris Element who defies her elders to help the water-breathing Kirk and Spock recover the means of changing back.
Rila appears in the Animated Series episode The Ambergris Element. She is one of the younger generation of Aquans, the sea-dwelling people of Argo, and is more curious than fearful about the air-breathers from the starship.
When the tribunal casts out Kirk and Spock, who have been altered to breathe water, Rila helps them. She tells them that the knowledge they need lies in the sunken ruins of her ancestors' city, a place the law forbids her people to enter.
She goes with them all the same and helps bring back the sealed records, which show that the antidote needs sur-snake venom. Rila also assists in catching one of the huge creatures. At the end she is among the Aquans who plan to rebuild on land that the predicted quake raises from the sea.