Yua Yaiba

Yua Yaiba is the technical advisor for A.I.M.S. and one of the main characters of Kamen Rider Zero-One. Despite serving A.I.M.S., Yua appears to be affiliated with a mysterious third party with ties to ZAIA Enterprises and also seems interested in escalating tensions between humans and HumaGears for unknown reasons. She has the power to transform into Kamen Rider Valkyrie with her Shot Riser.

History
Yua Yaiba was deployed as part of the A.I.M.S. squad under the command of Isamu Fuwa sent to respond to the rampage by the Berotha Magia. After the Magia is destroyed, she and Fuwa visit Hiden Intelligence to question their new CEO, Aruto Hiden, about the incident involving the Magia.