Students often ask me, "Who's your favourite student, sir?" and I truthfully answer, "That's like asking who's my favourite child?"
I don't have favourites - a student preferred to all other students, or a favourite child.
Of course, I do have students I like more than others. Those tend to be the ones who do their best to get better in class and outside of class; the ones who listen and act on advice; the ones who learn from the Pirate Code.
Of course, the corollary to this is that there are students I like less than others. Only natural. Those tend to be the ones who have to learn the hard way, who are really immature, who compromise the learner of others, and who don't learn from the Pirate Code.
That's different to having someone I favour above all others. Having a favourite implies favouritism - giving unfair preferential treatment to one person or group at the expense of another.
That would be troubling, and against my own Pirate Code. I aim to do the right thing, now, and teach all students to the best of my ability. Every day.