Beckman is a tall man,he is at least a foot taller than Shanks. In Luffy's hometown, he sports a black hair tied in a ponytail, and is never seen without his rifle nearby or a cigarette in his mouth. In the current storyline, his hair has turned gray and is cut short. He also now has a large X-shaped scar on his left temple.
His outfit has changed very little from his first appearance; he now wears a black, v-neck shirt with three quarter sleeves along with loose pants with numerous pockets on them, tucked inside his buckled boots. Like most of the other Red Hair Pirates, he wears a sash around his waist, to which he attaches his rifle in a pistol-like fashion. The only thing added to his attire is his spiral-patterned cape.
According to Eiichiro Oda, Beckman has the highest IQ of all the characters introduced in the East Blue saga. Since he is a first mate to a Yonko, he presumably possesses a great deal of strength. During the Battle of Marineford, Admiral Kizaru chooses not to fight him, even though he has just fought the First Commander of Whitebeard's crew and Whitebeard himself. It should be noted that Kizaru did, however, continue his attack on Luffy despite Beckman aiming his rifle at him.
Beckman also single-handedly defeats Higuma's crew of mountain bandits, telling Higuma to bring a warship as backup if he wanted to fight them.
Beckman appears to be a lot less fun-loving than the other members of the crew and a lot more relaxed, acting as the level-headed member. He, along with Lucky Roo and Yasopp, is one of Shanks's most trusted crew members as he is always seen when the Red Hair Pirates are featured, usually when something crucial happens.
At times, Beckman seems amazed at the actions of his captain, such as panicking when Luffy is taken or getting even more drunk when he has already drunk a lot before and when Mihawk brings the news of Luffy's first bounty. He is the first to speak out amongst the crew whenever they appear. He is also seems to be the first to ask questions about the crew's situation, such as whether the World Government would try to stop them from seeing Whitebeard.