Based on an actual historical figure, Saito Hajime AKA the wolf of Mibu was formally a captain of the 3rd unit in the Shinsengumi during the late Edo period. In Rurouni Kenshin he is a police officer working for the Meiji government. Saito was Kenshin's old rival during the revolution, and still holds their challenge in the Meiji era.
In the sony dub of Rurouni Kenshin known as "Samurai X" made in the late 90s, Saito is mostly referred to as "sato" and sometimes "Sieto." In this dub he is voiced by Daniel Woren.
When Mediablasters licensed Rurouni Kenshin and made their own english dub, Kirk Thornton was cast as Saito.
ADV had purchased the rights to the OVAs/Movies for the Rurouni Kenshin franchise and used their secondary studio Monster Island for these released. Saito is voiced by Ken Webster in the Trust and Betrayal OVAs, The Motion picture, and in the directors cut of the Reflection OVAs