Japanese name: メルティーナ (Meltina)
Japanese seiyuu: Wakana Yamazaki
English voice actress: Rachael Lillis
After graduating head of the class at the Flenceburg Sorcery Academy, she worked there as a researcher. She is a perfectionist who hates to lose and admits to being an egotistical narcissist with poor powers of self-analysis.
Valkyrie Profile was originally released on the PlayStation in 1999 in Japan and 2000 in North America. A PSP port of the game, renamed Valkyrie Profile: Lenneth, was released in 2006. Valkyrie Profile is the story of a valkyrie whose task is to recruit human warriors, called einherjar, for Valhalla's army in preparation for Ragnarok, the end of the world. The game takes place in eight chapters, each with a set amount of time allotted to recruit warriors and train them in dungeons. The game has three possible endings depending on Valkryie's performance at her task — the C ending if she does poorly, the B ending if done normally, and the A ending if special tasks are completed to see the "best" ending.
Mystina is met only in the Normal and Hard modes of the game and is a required character for the A ending. She can be recruited during Chapter 5 in Flenceburg.
As the rest of this site has significant spoilers for the A ending, I'd like to take this opportunity to strongly recommend you to play it if you haven't. Valkyrie Profile mixes together a deep story with a unique RPG battling system and platforming to great success. I've played it at least six times since I first played the PSP version in 2006, and although it's not the easiest game to pick up, taking the time to learn how it works is well worth it.