I know this may be too much for some, but:
Ysalamir Force Repel (UNIQUE)
Grand Admiral Thrawn takes 50% less damage from Jedi and Sith enemies.
This Unique will both make him more true to his Legends self and more viable against the current Sith Meta, and before you start telling me that Ysalamiri aren't canon... YES they are:
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Wild, wacky stuff.
These have sharp, meat-tearing fangs. They are not ysalimiri.