Koho was a clone trooper who served in the Grand Army of the Republic during the Clone Wars. In 21 BBY, Koho participated in the Battle of Devaron aboard the Separatist Munificent-class star frigate to recover a Jedi holocron that famous bounty hunter Cad Bane had stolen. Koho and fellow 501st Legion clone trooper Denal were attacked by Cad Bane, who killed them both and took Denal's armor to disguise himself and escape with the Republic forces.
The clone trooper known as Koho was born on the planet Kamino. A clone of the bounty hunter Jango Fett, Koho served in the Grand Army of the Republic with a battalion that was part of the 501st Legion. In 21 BBY, Koho participated in the Battle of Devaron, and while serving under Clone Captain Rex, helped Jedi Knight Anakin Skywalker and his Padawan Ahsoka Tano attempt to recover a stolen Jedi holocron and the Kyber memory crystal from the Duros bounty hunter Cad Bane. Tracking down Bane's personal Confederate Munificent-class star frigate, Koho was aboard one of the two AT-TE walkers that were deployed from the Venator-class Star Destroyer Resolute and onto the frigate. Entering the ship, Koho and the others followed their Jedi commanders and stormed the bridge, taking it with ease. Meanwhile, Bane planned to self-destruct the ship. As they secured the area, Admiral Wullf Yularen warned them that the ship was taking damage, and while Skywalker acknowledged, he was determined to lead his forces and recover the holocron.
Koho and Denal raise their blasters at Cad Bane.
Koho soon joined the fight against Bane and his army of battle droids. Tano was separated from the group as she chased after the fleeing Bane, who had the holocron in his possession. As the fighting continued, Skywalker ordered Rex and the clone troopers to find the frigate's hangar bay and secure a transport while he left to find his Padawan. Koho and several other troopers followed Rex and located a Sheathipede-class transport shuttle that was guarded by a group of B1 battle droids and DSD1 dwarf spider droids. As the clones engaged the droids in combat, Yularen once again contacted them and urged them to hurry, as the Separatist frigate was tearing itself apart. Rex then assigned Koho and fellow clone trooper Denal the task of locating Skywalker and assisting him with the capture of Bane.
While searching the doomed ship, Koho and Denal encountered Bane and attempted to force him to surrender. The hunter, however, overpowered them both and killed both Koho and Denal, taking the latter's armor as a disguise to sneak aboard the Republic forces' ship.
At birth, like the other clone troopers, Koho was implanted with a behavioral modification biochip by the Kaminoan scientists to ensure that the trooper would not resist certain orders. Koho wore unmarked Phase I clone trooper armor with a red visor attached to the helmet that allowed for night vision. Koho wielded a DC-15A blaster rifle.
Koho first appeared in "Cargo of Doom," the second episode of second season of the animated television series Star Wars: The Clone Wars. The episode aired on October 2, 2009. Although not identified in the episode itself, Koho was named in the show's Episode Guide, which was released on StarWars.com the same day as the episode.