Halo 4’s Cortana was the best with updated graphic, but staying consistent. Halo 5 is a close second. Halo 2 Anniversary was amazing but looked too different for me. Her “naked” appearance is a subtle jab at human’s need to anthropomorphize objects and societal constraints. It also spoke to her feeling of superior self-confidence. And now her armored suit in 5 speaks volumes as well. Cortana is now going to war for herself. I think the ordeal of her surviving rampancy has led her to be more guarded against vulnerability and this manifested with the armored suit.