5. Kes
A native of the Delta Quadrant which became home for our Voyager spacecraft, Jennifer Lien's character of Kes was instrumental in the ship's quest to return to the Alpha Quadrant. She was the life partner of the ships cook, Neelix, and a student of The Doctor, where she worked in the ships sick-bay and also attempted to help The Doctor with his inter-personal skills as it related to the crew. Kes was an Ocampan, and thus she possessed the race's psionic abilities. Her abilities would eventually evolve and with the help of Vulcan Tuvok, Kes would learn to harness her powers and eventually use them at the time of her death to send Voyager beyond the Borg-infested area of space, and 9,500 light years closer to home.