Kes

Left Ocampa's subterranean city, went to the surface, captured by the Kazon
2371: Rescued by Neelix & the crew of the USS Voyager, joined the ship's crew;
Served as a field medic, also in charge of the airponics bay
2371-2372: Mental powers started emerging, mentored by Tuvok
Body was taken over by the Ilari Tieran, freed by the Voyager crew
2373: Left Voyager to explore her increasingly powerful mental abilities
2376: Driven mad by her powers, returned to Voyager for revenge;
Reminded of her love for the Voyager crew, returned to normal & went back to Ocampa