Vader sends Marek to assassinate the mysterious Rebel informant - Fulcrum. Unfortunately for him, Ahsoka brutally cuts his head off as he utterly fails to gain any edge over her in combat. She then pisses on his headless corpse while proclaiming herself to be the ultimate Force wielder of the era, and proceeds to destroy the entire Imperial Inquisition by infiltrating their ranks wearing Galen Marek's skin.
Admiral Daala. Let's face it, Daala's the general grevious of the NJO and her giving Luke and the republic a hard time was awesome imo. I'd probably love to see her in Rebels learning from Tarkin(dmb don't you dare make that joke)
Dark Woman/An'ya Kuro. I always thought she was always so under exposed in the Legends universe and i feel that she has potential for this universe as strict instructor for Padawans and such.
Ferus Olin/Jax Pavan. badasses, former friends/rivals of Anakin Skywalker. what more could you want?
Ulic Qel-Droma, Kyp Durron, Thrawn, Mara Jade Skywalker, Darth Plagueis
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
I never saw the appeal of Revan as a character; he's an utterly blank slate that we are told is just better at everything than every other character.
N. is more interesting by far.
But if I only get one character to elevate to canon, then I've got to go with Jenna Zan Arbor as one of the only characters to show even a glimmer of curiosity about the Force.
"The Daemon lied with every breath. It could not help itself but to deceive and dismay, to riddle and ruin. The more we conversed, the closer I drew to one singularly ineluctable fact: I would gain no wisdom here."