Since there is no official Balance Discussion thread this place should serve as one.
You can post your opinions as well as suggestions for improvements.
Overperformes. Makes the concept of "tanks in front, damage dealers in rear" useless with her piercing attacks.
Underperformes. Lacks any distinct role. Too frail for a tank, too weak for a damage dealer and not good enough skills for a support. Rather than directing her towards one of those roles, significantly buff her Bloody Lance skill so that it makes a difference in a fight.
Her Bamboo Rain ability is too weak. It even says in her description "has a powerful slaying skill". A damage buff is needed. Otherwise works well in a support role, but is almost always overshadowed by other girls with better support skills, or changed for a pure rear damage dealer.