Ken Sakuma

Ken Sakuma (佐久間 ケン): A Destron Hunter, from Interpol, who helps V3 for a few episodes. He is Destron Hunter no. 5, and is the last surviving Destron hunter after they were wiped out by Doktor G.

Kamen Rider Spirits
In Kamen Rider Spirits, he became the head chief of Interpol, and was helping the 10 Riders from the shadows. He gave Kazuya Taki the equipment and resources to match the fighting abilities of the Kamen Riders as Skull Rider, and founded the mercenary group that he assigned to Taki and Anri to lead - Spirits.