Samantha and Bourne are a pair of pilots who were the leaders of the Dark Forces, a bandit group who operated in the deserts outside of Blue City. They piloted a Brachiozilla(Brachio Rex) and Missile Tortoise, which had the rather unexpected ability to fuse into the Brachio Tortoise. The group attacked the Mach Storm team in order to steal a cargo that Haldo was transporting.    [Source: Wikipedia]

R.D. is a delivery boy who works for a company called Mach Storm in order to earn money to search for the legendary Alpha Zoid. A Zoid that he heard rumours about from his dad that he passionately believes in. Mach Storm also doubles as a Zoid Battling team. In R.D.'s first Coliseum Zoid Battle, he encounters a team that can fuse Zoids. R.D. soon discovers that he has a Zoid that can computably fuse with his Zoid, Liger Zero. After this happens R.D.'s adventure to discover the truth about the Alpha Zoid begins.
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(Source: Anime News Network)

__Non-anime roles:__  
-Indies in "Armored Core 2: Another Age" (VG) (Japanese)  
-Say Aja in "Castle Shikigami 2" (VG) (Japanese)  