Like all Xenexians, Calhoun resembles a human almost entirely, with the exception of his purple eyes. His skin has a leathery, burnished texture, the years of hardship he endured early in life having given him a weathered look, with several deep creases already lining his forehead by the time he was 19. Calhoun has a scar down the right side of his face from his right temple down across his cheek, left by the wound Falkar inflicted on him with his short sword in 2353. He is a head shorter than his older brother, D'ndai. The renditions of Calhoun on the "" novel covers, and in the comic book "Double Time", consistently depict him as resembling a Caucasian human male with dark brown hair, though it appears as black in "Turnaround".