>>149225235
The coughing and him being hunched over were there to make him seem less of a droid and look more organic. I really like how the cartoon incorporated it. He didn't naturally have that hunch but it was a thing he did just so he'd be at eye level with everyone else, which then accentuated his height and made him look even more imposing when he stood up straight as he towered over everyone. Unironically just one of the many details that makes the cartoon design specifically a phenomenal villain design