Seer Cresus was a mystic on the planet Valdun. Aside from his enigmatic profession, he was disconcerting in appearance -- with a massive, four-eyed head and tiny, fetus-like body. He lived and traveled inside a carrying case designed specifically for him.
When Aeryn Sun, grief-stricken, sought to contact the spirit of the deceased John Crichton she visited Cresus. When Aeryn touched his head, he seemed to summon Crichton's spirit. It is unknown if Cresus is an actual mystic, able to contact the deceased, or if he has telepathic capabilities that allow him to scam the grieving.
Cresus is seen in an episode of Farscape.