Sayo (サヨ?) is a rising Tamer in the Night Claw organization, and is Koh's main rival. Her design is the female version of the protagonist from Dusk. She is partnered with Lunamon, Lilamon, MachGaogamon, and her NaviDigimon Phascomon, although she also acts as a stand-in Tamer for SkullScorpionmon, ChaosGallantmon, Zanbamon, Gaiomon, GranDracmon, and WaruSeadramon while heading "Team Moonlight".
Sayo is a girl with fairlightly tanned skin, waist-length light purple hair, and purple eyes. She wears black eye goggles over a purple hat with two points that resemble cat ears coming out of it, a turtlenecked blue shirt, a black and purple jacket with long sleeves, a black and purple skirt, blue and black striped stockings, and black and pink sneakers. She also carries a white and black object in a pendant.
- Sayo (サヨ)
- Ja: "Sayo" (小夜? lit. "Evening").
Digimon World Dusk
Digimon World Dawn
Sayo first faces Koh during the Normal Tamer Tournament. However, she is the only Night Claw Tamer to not fall under the ChronoCore's control, although she is confused when her possessed teammates attack Koh during the "Night Crow Assault" quest, and initially challenges him to battle to punish him for "hurting her friends". Afterward, she escapes Darkmoon CITY and allies with Light Fang to save her team, even battling Kowloon Co. with them. They use her Digivice to create an access portal to Darkmoon CITY, and she even lends Koh her Digivice to help him pass through. She eventually attains the rank of Platinum Tamer, and faces off against Koh in the Legendary Tamer Tournament.
Digimon Story: Super Xros Wars Red and Blue
Sayo is fought in the Gold Tamer Match and leads Team Moonlight (ムーンライト Mūnraito?).
Digimon Story: Cyber Sleuth
Sayo's partner, Dianamon, went missing in a fight with the Great Demon Lords. After defeating all seven, Aiba teams up with Sayo in fighting Mirei Mikagura's Digimon, a Monzaemon with the power of all seven.