Morango is one of the three Arwen brothers. He is strong, protective and morally serious.
He hates racism and is deeply opposed to slavery, captivity, imprisonment and oppression. He actively resists injustice, although he can still follow another person or go along with a course of action while objecting to it.
That tension matters: Morango is not simply obedient or rebellious. He can stay with the people he loves while making it very clear that he thinks they are wrong.