Qui-Gon Jinn

Qui-Gon Jinn was a Jedi Master active in the decades preceding the Clone Wars. Originally the Padawan learner of then Jedi Master Dooku, Qui-Gon passed his trials of knighthood and eventually took his own apprentice Obi-Wan Kenobi. Noted as a wise individual with talent for negotiation Jinn and his Padawan went to the planet Naboo to act as ambassadors for the Republic to the Trade Federation who become increasingly indignant over various taxation policies. The two Jedi were subsequently swept up into the battle that followed in which Jinn was later killed by the Sith warrior Darth Maul who will be later cut in half by Kenobi.

Before his death, he found Anakin Skywalker in Tatooine and recognized him as the Chosen One, and pleaded with his apprentice to train him, which the latter agreed to do his wishes.

Mortis
Qui-Gon's Force-ghost appeared to Obi-Wan on the planet Mortis where he guided Obi-Wan and Anakin Skywalker through the Force-wielders' interest in the Chosen One.

Appearances

 * Star Wars: Clone Wars -- Chapter 1  (Mentioned only)
 * Star Wars: Clone Wars -- Chapter 19  (Vision to Anakin Skywalker)
 * Star Wars: Clone Wars -- Chapter 21  (Appears in flashback(s))
 * Star Wars: Clone Wars -- Chapter 23  (Mentioned only)