[Uh-Nu-Buh]

Japanese Monsters you might want to incorporate:

Oki--giant hill-troll types. They eat humans. Big and dumb.

Tengu--big nosed goblins. Very big egoes. Small, not powerful, but high morale.

Kappa--amphibious frog people, nature/water magicians. High culture.

Fox-Men--shape shifting nature spirits, tricksters, magicians. Powerful and dangerous.

Crazy Women--like bansidhees, crazy women had long hair, screamed and wailed, and were evil spirits of death and jealousy.

Shinto Spirits--wide and varied nature spirits. Mountains, stones, trees, rivers, kind've like elementals. Powerful but remote.

Lone Buddhist Magician--very powerful mages in stories. Wide variety of magics, but whatever they specialize in they are good at (3'rd or 4'th level random magic type?). Always alone, without other commanders or troops--don't know if this can be done.