Given the anti-slavery policy in Winterfell, isn't Bran a particularly dark character?

Is Bran, a male highborn, entitled to a hand servant? Hodor, Bran's servant, is never offered the best food, time to rest, or ever thanked. His efforts are not even recognized. Bran can even snatch Hodor's body to amuse himself.

Bran abuses a mentally disabled person with impunity, and no one challenges Bran.

(1) does this demonstrate people are afraid of Bran and won't challenge him?

(2) The acceptable abuse of Hodor is there to show use how much modern civilization has advanced? In the 21st century, Bran would not be allowed to abuse Hodor.

(3) Hodor really does have free will and wants to be Bran's servant?

(4) Hodor is not a servant. Rather he is "something else"?