While on my recent trip to Yamaguchi searching out the autumn colors I came across another unusual Fudo Myo. This statue is at the base of the steps leading up to Ryuzoji, and as you can see he has absolutely nothing in either hand. His hands appear to be in a mudra, which are the hand positions that Buddhas and other Buddhist deities use, often to indicate the nature of the particular figure. Mudras are also used as a meditation technique.
As is often the case with things Japanese, there is no one set of meanings to anything. Some sources say Fudo has nine mudras associated with him, some say ten, and one says fourteen. As far as I can tell this mudra goes by the name of rin in Japanese, though an older pronunciation is ten. I believe it is known as a "power" mudra.
The other thing that was slightly unusual with this statue is that both his fangs are pointing downwards. Normally one is up and the other down, though I have seen quite a few as in this photo..