As the main antagonists of iGo to Japan, Kyoko and Yuki are the two evil Japanese web comedians that tried to sabotage Carly, Sam, and Freddie's chance of winning the iWeb Award. Both groups were in the running for the award and considered each other strong competition, even imtimidating the iCarly crew, somewhat. On the other hand, Kyoko and Yuki feared the influence of iCarly, and plotted to eliminate them from the equation so they could have a higher chance of winning. Initially, the duo acted as friends to the iCarly gang, but eventually show their true colors when they drive to the middle of nowhere, leaving the three stranded and lost, while they would try to win the iWeb Award by default, (due to iCarly being a no show). However, due to Spencer, Mrs. Benson, and some quick thinking, they were able to make it to the event, and won the award. Afterwards, the siblings got arrested for kidnapping the iCarly team.
As seen during the fake fight, they set up to trick the iCarly gang, they are both accomplished martial artists.
- Kyoko is played by Ally Maki, (credited as Ally Matsumura), and Yuki is played by Harry Shum, Jr., best known for playing Mike Chang on the Fox Comedy series Glee.
- Shum had previously appeared in the Zoey 101 episode "Trading Places", as the waiter who served Zoey sushi.
- The two actors put on heavily exaggerated Japanese accents for their roles; the two actually have American accents.