Japanese actor and martial artist Sho Kosugi is responsible for the main character Rikimaru's motion capture, as well as providing all of his Japanese voice work. His son Kane Kosugi was also involved, but as to which capacity, official accounts vary: Sho's official bio states that Kane provided the motion capture for the second main character Ayame, although in the game's closing credits, he is only credited with providing the motion capture for the antagonist character Onikage.

While this fact is virtually unknown unless you were to read the game's credits, it was heavily promoted in its native Japan, going so far as to even include a rare "Making Of" CD with snippets of the motion capture sessions as a special bonus to people who pre-ordered the original Japanese release in early 1998.