Let's talk about Dooku a bit. I welcome feedback into it.
Of the Masters I proposed, Dooku is perhaps the strangest because he has zero screentime as a Jedi. We as viewers and readers see him only after he passed to the Dark Side and while we have his internal POV, notably in the Revenge of the Sith novelization, it can be difficult to reconstruct what he was as a Jedi.
Notably because Star Wars loves foreshadowing the moral path of the characters so the annotations of Dooku in the Jedi Path show him as the aristocratic saber enthusiast he was as Darth Tyranus. Still I think it's an important point in his character.
Dooku puts the Knight in Jedi Knight. He is someone who considers to be a Jedi is to be a noble. He choses the most refined form of lightsaber duelling. As Darth Tyranus he praised the samurai/ninja Tholme on his own technique. As a Sith he presented a faux affably evil face where he played at being reasonable before unleashing the lightning.
And boy how he loves the lightning. Palpatine is more associated with the power with good reason, but he uses it mainly as a means of torture. Dooku incorporates it nearly seamlessly in his fighting method.
We know he was trained to be a politician and I can't help but think the aristocratic image was part of that. He could engage with Republic elites as a peer rather than the congeniality of Obi-Wan, the wisdom of Yoda, or the intimidating presence of Mace Windu. Yet when words fail, Dooku reacts with overwhelming force (and Force). As a Jedi that means telekinesis but I can see a case for him using Force Choke.
As a Sith, he was interested in Sith sorcery and ancient artifacts and I chose to include it in the character. He is someone who thinks the key to defeating the Dark Side is to know it, even if his missions don't put him in contact with the relevant artifacts.
So a warrior-scholar, possibly a philosopher.