Momiji

From Ninja Gaiden - Wiki on Neoseeker

Momiji is a young female ninja in training, first seen in Ninja Gaiden: Dragon Sword, and secondly in Ninja Gaiden Sigma 2.

She has proven herself to be a prodigy, being skilled in swordplay and the various ninja arts. Momiji is usually training with Ryu in the Hayabusa Village, in Dragon Sword.

In Sigma 2 she is armed with a long lance and takes on a ranged attack style, much like Rachel from the first Sigma.