Welcome to Librarium Online!
I have a Ninja ogre and well i'm not sure what to allocate his weapon as is it a cathayn longsword a great weapon or just a bog standard weapon?
Welcome to LO! Nice to have another member on board .
Looking at the model itself, I'd say you could feasibly use either. If your opponent really questions use of it as a Cathayan Longsword, then you could just say something like:
"But he's a ninja. And katanas are just better", or something along those lines.
If you used it against me, I'd certainly allow it, but then again, I tend to be rather liberal on these matters.
Hope that helps.
Aren't the Cathayans based off of oriental culture?
If so, wouldn't a Cathayan Longsword fit with the idea of a katana?