Thirties. Hard on the outside, soft on the inside.
The Tracker was born and raised on a magical reservation in Arizona. He never went to Ilvermorny but rather received his magical education on the reservation. He showed a natural talent for tracking and developed a deep love and understanding of nature and all the magical creatures it held. When he was nineteen the reservation was visited by outsiders, ministry officials, they were tracking something and it had crossed into reservation territory. They needed the assistance of a tracker. The outsiders were met with mistrust and hostility with no one willing to offer them assistance. Having known no other world than that of the reservation that he had been raised on the Tracker stepped forward to offer his help believing that the outsiders were not as bad as everyone said. This would be the first of many times that the ministry would call on him for help. His work with the Ministry took him from the reservation and to the wider world.
Being considered possibly the best in his field the Tracker was sent by the MACUSA to assist with the growing number of creature attacks. Having being in the country for only a month or two he is still finding his feet and his place within the unit. He wants to help the magical creatures that he tracks and traps, he doesn't want to see them destroyed like others in the unit. It's causing some conflict within the unit. His appearance might suggest that he is a harsh beast of a man but the Tracker is a in fact a giant sensitive softy who is gentle and compassionate but at the same time he will fight for what he believes in.
I feel like Native American history has some interesting mythology when it comes to werewolves and wolves in general so I think that could be something interesting to add to the Trackers mythos and sense of belief, offering a different perspective on things.
PB: Jason Momoa, as if there is any question about it?