Lienwha

Loyal citizen of the FN, she's the fourth child of a noble family of Nasrin Island. Master NPC. Based around Prodigy playbook (pg195). Firebender.
Drive: to be a more capable firebender than her siblings. (She can't inherit and she doesn't want to, but she can be strong in her own right)
Principle: Excellence 0 +1 +2 +3. Starts this way but if she ever gets her balance shifted far enough, it should change to Community or else perhaps Vengeance. Either she gets softer or she gets harder.
10 Fatigue
Conditions: Angry, Guilty, Humiliated, Insecure, Troubled.
Very long black hair, brown eyes, sharp eyes.
Flame Knives: advance and attack. Mark up to 3-fatigue. Hold an equal number of flames. Lose 1-flame at the end of each exchange after this one. When you inflict fatigue or conditions on a foe, inflict an additional 1-fatigue for each remaining flame.
A Single Spark: evade and observe. Unleash your emotions into the flames around you. Mark 1-fatigue to hold 1 or each condition you have marked. Spend your hold 1-for-1 in the next exchange to pay the costs of techniques as if it was fatigue, to inflict Doomed on a foe you target with firebending, or to use Seize a Position--no matter what approach you used--in addition to your other techniques.
Rapid Assessment: evade and observe. Quickly take in your situation far faster than normal. Ask one question about the situation at hand. Become Prepared to act on the answer, and you may call out your plan to an ally to make them Prepared as well. Pounce*: advance and attack. Press the advantage against an enemy who is off-balance. Mark 1-fatigue to inflict Impaired on a foe, or inflict Stunned on an Impaired foe, or inflict 5-fatigue on a Stunned foe.

Background details

Her family is twins Shen and Sana, slightly older brother Rohan, and parents Zao and Sorami.
She doesn't know a lot about the background of the shrine just yet, but she does have the noble family connections that she could get info from the fire sages if she really wanted to dig. She's a floater, someone who could become an ally or an enemy depending on who she talks to in the background and how the story plays out. I'll want to keep track of what she's doing when the PCs aren't looking.
She wants to prove that she's capable. She's not seeking to inherit, just get the approval of her family. For now. She could be manipulated into seeking more. She could also be shifted into finding her own path through these things.
She likes the PCs so far. They're chaotic but she doesn't mind that. They're in the same boat as she is, so she's not lagging behind or anything.