Sora Bulq, the Jedi-turned-Sith-acolyte, first appeared in the novelization of Attack of the Clones.
The novelizations introduced a number of elements that other books and comics subsequently exploited. If you didn't read the Expanded Universe, this may not seem like a big deal to you, but it is. Del Rey's Star Wars team has confirmed that the novelizations of Star Wars Episodes I-VI and The Clone Wars are part of Lucasfilm's new unified The novelizations of the seven films-including The Clone Wars-are canon.- StarWarsBooks April 30, 2014