Darth Revan, Due to his complexe mentality and minset, +given the fact like tzeench if you succefully brain wash him, this because it was a part of his plann and you will not get control on it soon.
It is staten that the Jedi council had hard time to "cure" him from the Darkness within his soul, and the dude was mensic, and regaining slowly his memories !!! the fact that they must a have used a particular technic...
N°2, End Novel Revan during his fight with vitiate, despite having probably not reform his complexe mindset, hum well.... Humhum.. I remember when in versus topic everybody was thinking yhe mais heu Revan is weak to TP due to.. SHUT UP you in my head I cannot wistand anymore of your stupidity ! Revan was a Strong willed dude and I was right !
N°2 HoT Obviously.
N°3 Darth Nox.
4 palpa,
5 Luke
6Cadeus.