It’s subtle, but it’s there. Mostly featured in the TCW episodes “Lair of Grievous” and “Grievous Intrigue.”
Legend Grievous was a victim of Separatist manipulation and Jedi folly in the Huk War. He didn’t choose his cybernetics, they were forced on him. But they made him a better warrior.
Ever battle with the Jedi was of vengeance. After wants the Jedi did in the Huk War against the Kaleesh, Grievous is pretty in seeking revenge.
But he never lost. He kicks the crap out of respected Jedi Masters without breaking a sweat. It makes his defeat at Obi-Wan’s hands a hard sell, and I’m not sure there is anything to take away from his arc other than the Jedi were naïve and four-armed cyborgs with lightsabers are bad-ass.
That’s less interesting to me than what Canon does with him.
Grievous was fearless, proud warrior, but he was dissatisfied. He wanted more. He chose his cybernetics, thinking it would make him a better warrior. He’s self-obsessed, enshrining his glory days in statues and collecting trophies of the Jedi he slays. All because he worships war and his own glory.
Wars do not make one great.
After his “improvements,” he’s a shell of his former self. He’s routinely beaten. He flees from battle whenever he’s outmatched. He lives on the reputation he established for himself before his cybernetics, but is reduced to being Dooku’s errand boy and, at the end of the day, a bully.
And for the most part, Grievous recognizes this. But he’s a prisoner in his own body. It was too late.
I found it to be a nicely crafted cautionary tale about obsession and war, and how would an individual would sacrifice in the pursuit of greatness.
Besides, his Canon interpretation is far more consistent with his depiction in Revenge of the Sith.