Kanan Jarrus was a young boy whom was being trained to become a Jedi Knight during the final days of the old Republic.
Kanan Jarrus was created for the Star Wars: Rebels television series, but was brought into comics when Marvel re-acquired the rights to publish once more. His first comic book appearance was in Kanan - The Last Padawan issue 1 (2015).
Major Story Arcs
While Caleb Dume was with on a mission with his Jedi Master, Senator Palpatine executed Order 66, which caused the clone troopers whom had stood with them for years, to turn against the Jedi. Caleb had to flee and went underground, fearing for his life since the Jedi had been made enemies of the newly formed Empire.
While in hiding, he rid himself of his name and disguised himself as a new person. He became nameless and worked with Janus Kasmir as a black market dealer, but not for long. The clones that turned on him never stopped searching and during one deal, they attacked and stole him. He fought his way out of their ship and detonated it, killing the clones he once fought with for years.
Caleb then realized that as long as he is with Janus, Janus will never be safe. So he left him and joined a group of rebels under the new name Kanan Jarrus.
Star Wars: Rebels animated series
Kanan Jarrus appears in the new animated series, in which he is the star of the show.