Fujin's weapon in the game is called a shuriken (aah, it all makes sense now, eh?). It is similar to Rinoa's pinwheel, though Fujin's is bigger and she holds it, rather than it being on an arm band of sorts.

The weapon is blue and silver. Around a silver blade are 'wrapped' blue blades, and what looks like either grips or just decorations of blue poking into the inner part of the circle. That's really about it.

Actual shurikens are most known to be cross-like shapes, though there is a large variety of them. I'm not exactly an expert on them, so feel free to send me any extra information which may prove interesting.