You are going to fall in love with Captain Nicholls and it is going to leave you a great deal of emotional trauma afterwards when he dies. He's played by Tom Hiddleston, what did you actually expect? Even though the movie is about a horse, Nicholls is one of the best characters.
"I want to show him how beautiful Joey's looking, the boy who sold him to me."
"I promise you, that I'll look after him as closely as you've done, I'll respect him and all the care that you've taken with him. And if I can - I'll return him to your care"
-Both quotes on the horse Joey in regard to Albert.