|Master||Oikawa Yukio / Vamdemon|
|Voice Actor||Yamazaki Wakana (山崎 和佳奈)|
Archnemon is a hybrid composed of data and human DNA, created by Oikawa Yukio. She is capable of transforming from her Digimon form into a more humanoid form, that of an attractive young women with long, bluish-white hair who constantly wears large purple shades. However, it is unknown whether this is because she is a hybrid, or because of her species' innate ability to transform into a human form. She also possesses the ability of using the hair from her head on Dark Towers to create artificial Digimon.
Archnemon is a proud and arrogant individual. She enjoys being a villain, and gets a kick out of teasing the Chosen Children in a bullying manner. She is extremely impatient and short-tempered, and tends to throw tantrums when things don't go her way. Archnemon is very loyal to Oikawa, and rarely questions his commands. Her partner and fellow hybrid, Mummymon, is deeply in love with her, but she arrogantly rejects his advances and constantly insults him. And yet, after Mummymon joins her in the battle against the Chosen Children, they are rarely seen apart.
Archnemon first appeared in Digimon Adventure 02 - Episode 24, taking over after Ichijouji Ken shed his Digimon Kaiser persona following the destruction of Chimeramon. She initially appeared in her human form, confusing the children as to why an adult is able to enter the Digital World. To fight them, she sent artificial Digimon she had created using Dark Towers to cause havoc and destruction in the Digital World. However, after the children started destroying the Dark Towers, she got fed up and called them over to the Giga House, where she used a flute to control the resident insect Digimon and turn them against the Chosen Children. When the Chosen managed to negate the flute's powers, Archnemon decided to take drastic measures and shifted to her Digimon form. She fought the children and proved to be a formidable foe, but was defeated by Paildramon. Fortunately Mummymon, her partner, came to her rescue. Following the failure at the Giga House, she worked exclusively alongside Mummymon.
To get back at the children, Archnemon created Black War Greymon using one hundred Dark Towers, but he didn't obey her due to the complexities of his creation. Following Mummymon's suggestion, Archnemon decided to try and destroy the Holy Stones, which were rumored to keep the Digital World's balance in check. While they found the first Holy Stone difficult to destroy, a Knightmon Archnemon had created managed to delete the Holy Ring surrounding the stone, which prompted Black War Greymon to destroy the stone. Pleased with the turn of events, Archnemon and Mummymon follows Black War Greymon around as he searched for the Holy Stones, fighting the Chosen Children off to prevent them from stopping their destruction. However, when only one Holy Stone was left, the Chosen Children used their Digivices to free Qinglongmon and the Holy Beasts from their imprisonment inside the Stones, and they used their power to reseed the Stones, foiling Archnemon and Mummymon's plan.