Jeff is one of the few returning enemies in the arcade version of Double Dragon II who retains his original design, the other being Willy himself. Jeff himself appears to be mislabeled "Willy" and given Roper's artwork in the manual.
In the game's manual, his artwork from the Master System manual is used for Roper. However, he's easier to defeat in this version since he cannot escape from the player's hair grab. In the Genesis port of Double Dragon, Jeff loses his unique face and appears simply as a recolored Lee brother.
Since licensed conversions of the first Double Dragon (namely the home computer versions) used the backstory and character names from the NES version, their manuals listed Chin instead of Jeff as an enemy character, regardless of who was actually featured in the game. Jeff in particular was replaced by a new enemy character named Chin Taimei. In the NES version, Jeff and Jick (the other head-swapped enemy in the arcade version) were cut from the enemy roster, making them the only enemy characters who were not officially named by TechnÅs. In contrast to the green outfit he wears by default in the arcade version, Jeff wears a gray outfit and has a red shirt. Jeff's design in the Master System version is a bit different form his arcade counterpart, having a pompadour hairstyle similar to Billy and Jimmy's (instead of his characteristic widow's peak), but with different eyebrows. However, due to a localization mishap, Jeff and Willy had their names swapped in the English version of the manual and many gaming publications incorrectly identified him as "Willy" as a result.
The name "Jeff" was first used for the character in the Master System version published by Sega, which was released a few months after the NES version. These grunt versions of Jeff are colored differently from the boss version of the character. In addition to the initial boss version, grunt versions of Jeff also appear during the latter half of Mission 3 guarding the entrance to the gang's hideout, and at the end of Mission 4 to assist Willy during the final battle. Despite this, he's still tougher than the regular grunts and can escape from hair grabs when he still has enough health left, making him a very difficult opponent to contend with when engaged among groups of enemies or even by himself. Jeff is a head-swap of the Lee brothers who employs most of the same techniques as the player, lacking only the ability to use weapons. Prior to this, he's first seen in the opening sequence among other members of the Black Warriors when Marian is knocked unconscious and carried away. Jeff appears in the arcade version of Double Dragon as the end boss of Mission 2. 1.4 Double Dragon II: Wander of the Dragons.