Out of the Abyss
Shuushar the Awakened
Kuo-toa hermit and mystic.
Degenerate, fish-like humanoids, a race driven mad by the Mind Flayers.
This kuo-toa is unusual, calm and peaceful. He claims to be a pacifist and has spent his whole life to achieve a state of enlightenment.
He escaped with you during the jailbreak.