Man, this is hard! There are so many wonderful officers and crew members aboard HAL ships.
I agree that Captain Scott is amazing. He's really a great person, and so warm and friendly. Some captains have come across as "I'm here doing this and smiling because I have to, but I'd really rather be somewhere else." Not Captain John Scott.
Ali is one of the wonderful dining room stewards who we've had on two different ships. He was top-notch.
I guess overall I would say it's James Deering, Hotel Manager aboard the Oosterdam. He's truly a dedicated professional who shows genuine interest in the satisfaction of his guests. The only HM who I ever saw give people his business card with his phone number on it!