Many of the character in the back half of the Ahsoka series on Disney+ are old Star Wars favorites like Ezra Bridger and Grand Admiral Thrawn. Still, fans love a new character, especially a cool villain with a scary mask. Enter Captain Enoch whose doonium facemask looks gold, wearing a blank expression. He seems to be the right-hand for Thrawn's forces, coordinating troop deployments while not actually fighting in the battle. This role actually fits with the theological character Enoch, adding to Ahsoka's theme of mythology.
Source:https://www.cbr.com/captain-enoch-thrawn-ahsoka-mythology-star-wars/