Neither Biggs nor Wedge are distinguishable from any other brown-armored imperial soldiers. They share a menu sprite which shows a small amount of blond hair peeking out from under their helmets. In the CG cutscene intro for the PlayStation release, one is shorter and stockier than the other, but there is no indication given as to which is Biggs or Wedge.
Both are professional soldiers focused on their mission. Wedge is skeptical regarding the presence of the esper in Narshe, but carry out their mission regardless. They express hints of fear or disdain for Terra: being concerned if she's sufficiently controlled by the Slave Crown and deciding to have her take point in the attack on Narshe to avoid the risk.
The three are sent to Narshe to investigate a frozen esper the miners have dug up in the mountain. Though skeptical, they presume Terra's presence means their superiors are taking the rumors seriously. The three march on the town, putting Terra on point, and fight through Narshe's guards to reach the Narshe Mines. The three battle a monster called Ymir the guards have trained to guard the mine, and destroy it.
In a new mine shaft the three find the frozen esper Valigarmanda, but as they approach it, it reacts to Terra's presence. Biggs and Wedge vanish in flashes of light and are probably killed.
Biggs and Wedge's job wasn't listed within the Super Nintendo version of the North American game. It was removed. There's no entry within Final Fantasy III Nintendo Player's Guide, so their jobs are unknown. The English Gameboy Advance version retained the job titles and Biggs and Wedge are Soldiers.
The two soldiers called Biggs and Wedge appear in Chrono Trigger, as employees in Norstein Bekkler's Tent of Horrors. A V-Jump issue in Japan humorously state that after Valigarmanda made them disappear in Final Fantasy VI, they ended up in the Chrono Trigger dimension and were found by Norstein, who gave them their new jobs.
Valigarmanda dispatches Wedge first, then Biggs. This reflects Star Wars in that Wedge was forced to withdraw from the battle after his fighter was damaged, and afterwards Biggs's fighter was destroyed.
Early screenshots of the game's Japanese version call Biggs, Reo (レオ?), and Wedge, Banan (バナン?), respectively. Interestingly, these are the Japanese names of Leo and Banon. Likely the names were conceived before they were given to the actual Leo and Banon, and the soldiers were used as placeholders until the former's final designs were determined.
On April 11, 2013, Producer's Letter Live for Final Fantasy XIV: A Realm Reborn, producer Naoki Yoshida (Yoshi-P) showed a video to spotlight the Magitech Armor in the game. The video was, at his instructions, heavily inspired by, and designed to evoke, the opening scene of Final Fantasy VI, and featured characters recognizable as Terra Branford, Biggs, and Wedge.