1) Stylianos came onboard due to his wide knowledge base, skill at oration, and skill at the art of diplomacy and deception. Captain Fairhorn hired him to entertain the rest of the crew and to speak with any natives the expedition may encounter.
2) Stylianos answers to Captain Fairhorn to the extent Captain Fairhorn is the Captain of the ship. Stylianos sees this as a job where he gets to travel and see the world, but its still just a job at the end of the day.
3) Stylianos recieves pay.
4) Stylianos is part of the crew.
5) Stylianos wanted to escape his home, because it was boring there and he wanted an adventure.
6) Stylianos is part of the crew.