A gentle Vau N'Akat astronomer on Solum who has not yet become the tyrannical Diviner, and who befriends his future daughter Gwyn in the second season of Star Trek: Prodigy.
Ilthuran is the man the Diviner used to be. In the first season of Prodigy the Diviner is a dying zealot from the future, sent back in time to destroy Starfleet. The second season, set in 2384, takes Gwyndala to Solum decades before its civil war, where she meets his present-day self: a stargazer who believes, against his people's doctrine, that there is life beyond their world.
Introduced in Into the Breach, Ilthuran accepts Gwyn's account of herself and backs her when she challenges the time-displaced Asencia in Who Saves the Saviors. Gwyn loses the duel and has to flee, and Ilthuran stays behind as Asencia takes control of Solum.
In Ascension he warns Gwyn of the takeover, and in Brink he is rescued from captivity. In Touch of Grey and Ouroboros he rallies the Vau N'Akat against Asencia, helping Gwyn and the Protostar crew to bring about a peaceful first contact with the Federation.