Describe Mr. Morrison?

In Roll of Thunder, Hear My Cry, Cassie Logan is a nine-year-old, African American girl living with her family in an environment of violent racism in Mississippi in the 1930s. Cassie's Papa brings Mr. Morrison to work on the land he owns and live with his family to help protect them when Papa has to go to work in Louisiana.
Mr. Morrison is also African American and is quite strong and large in stature. He apparently towers over Papa, who is pretty tall himself at six feet two. Mr. Morrison also has some scarring on his face from when he was caught in a fire as a child (the fire was started on purpose by white men, who killed his parents). This quote should give you a pretty good sense of his overall appearance: 

The long trunk of his massive body bulged with muscles, and his skin, of the deepest ebony, was partially scarred upon his face and neck, as if by fire.

With all that said, Mr. Morrison is also pretty quiet—not a man of too many words. He very obviously cares for the Logan family and will do all he can to protect them.