Beckman is a tall man, standing at a height of 206 cm. Twelve years ago in Monkey D. Luffy's hometown, his hair was long, light brown (black in the anime) and pulled back in a pony tail. In the current storyline, his hair is now gray, medium-length, and slicked-back. He also now has a large, X-shaped scar on his left temple. He is never seen without his rifle nearby or a cigarette in his mouth.
His outfit has changed very little over the years since his first appearance; he now wears a black, v-neck shirt with three quarter sleeves (whereas he is previously seen wearing a short-sleeved shirt of a similar color and design) along with loose pants (originally of a dark green color, but presently gray) 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 cloak.
Beckman appears to be a lot less fun-loving and a lot more relaxed than the other members of the crew are, acting as the level-headed member. He, Lucky Roux, and Yasopp are some of Shanks's most trusted crew members, as they are always seen when the Red Hair Pirates are featured, usually when something crucial happens.
At times, Beckman seems amused 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 Dracule Mihawk brings the news of Luffy's first bounty. He is the first to speak out among the crew whenever they appear. He 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.
As an Emperor's first mate, Beckman can be assumed to hold significant combat ability.
Twelve years ago, Beckman single-handedly defeated Higuma's crew of mountain bandits using only a cigarette and his rifle as a club.
At the end of the Battle of Marineford, Marine AdmiralKizaru chose not to engage with Beckman when the latter had him held at gunpoint, even though Kizaru had fought Marco earlier and even Whitebeard himself. Though given pause and putting his hands up in seeming surrender, Kizaru did shortly thereafter continue what Beckman sought to prevent him from doing (trying to assail Luffy), suggesting Kizaru had not truly been cowed by Beckman's presence.
A highly intelligent man, Beckman has the highest IQ of any character introduced in the East Blue Saga (above the master strategist Kuro's).
Demonstrating some stealth prowess, when the Red Hair Pirates arrived at Marineford to stop the war, Beckman was able to climb up and sit on a Marine ship's mast to point his flintlock at a nearby Kizaru, a Kenbunshoku Haki user, without the latter noticing until Beckman made his presence known.
In Foosha Village, Beckman tried to explain Shanks's decision on refusing to take Monkey D. Luffy with him to sea. Unfortunately, he found that his captain left him in somewhat of an awkward situation, since he seemed to enjoy mocking the fact that Luffy could not swim, leaving Beckman to explain that Shanks really was not that happy all the time. Later on, after the Higuma incident, Beckman and Lucky Roux took on Higuma's men. He shocked Higuma by taking out every last bandit, leaving only Higuma standing.
When Dracule Mihawk informed the crew about the up-and-coming Luffy, Beckman was surprised at this fact. With his crew, they celebrated and invited the Warlord to the party despite Shanks and his crew already being worn out from another party the night before.