Nel Zelpher

She is a highly skilled covert operations agent of the Kingdom of Aquios on Elicoor II and the leader of the Secret Legion, a special detachment of the Queen of Aquaria's personal guard that reports directly to her and is responsible for intelligence gathering. Her loyalty to her queen and country motivates her every move and action. Nel is a skilled fighter who uses short swords and Runology interchangeably.

(Source: Star Ocean Wiki)