Shidou is an exclusive character. He is shown wearing a bird like mask, underneath the mask he has long sliver hair and blue eyes. Shidou is usually seen wearing a dark purple suit along with a matching dark purple two layered cape (resembling bird feathers) with gold trim.  (Source: Hayate no Gotoku Wiki)

A former operator of the Japanese Ministry of Defense's secret SR unit. Tojo had seen action in several black ops operations, including Cuba. He left SR and was recruited by Kasper within 20 minutes. His full name is Akihiko Tojo. He is put in charge of giving Jonah Math lessons.  (Source: Wikipedia)

Hayate's Second-in-Command in Long Arch as well as the son of TSAB Admiral Leti Lowran. He has known Nanoha, Fate and Hayate for some time and is childhood friends with fellow MS6 member Shario Finieno. He is allegedly named for the TVR Griffith.    --Wikipedia

A member of the Imperial Army ESP Unit. He has the a ability of metempsychosis, which allows him to transmigrate or switch his mind into an animal's body.

__Non-anime roles:__ 
-Motoki Mihara (Vin Threet) in "Time Hollow ~Ubawareta Kako o Motomete~" (VG) (Japanese)

Hitoshi Yanai

Characters