Sandstorm is one of the most elite fighters the United States has at their disposal. Being born in the hottest depths of the Sonoran desert, they have become very accustomed to the terrain if a desert.
While it is quite obvious he is human, he doesn't ever elaborate on any of his attributes leaving most of the people who often work with him to assume he is male. Since he hasn't objected to this estimation, it's been assumed that way. He is often quite cold in his tone, leaving everyone to wonder ether he actually cares about anything. Yey this might be very good for him, leaving him focused on his goals and without bias toward anything.
Sandstorm is very good with a gun, very, very good. With very precise shooting and very skilled reloading and aiming skills. It will be quite interesting to see how he interacts with a fantasy based world.
(the simplified version to the bottom right is left colorless to read the lines easier.)