Japanese actor and martial artist Sho Kosugi is responsible for the main character Rikimarus 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: Shos official bio states that Kane provided the motion capture for the second main character Ayame, although in the games closing credits, he is only credited with providing the motion capture for the antagonist character Onikage.

While this fact is virtually unknown in the west - other than for astute readers of the games credits - it was heavily promoted in its native Japan, going so far as to even include a pretty 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.