Functional Order: Ni/Fe/Ti/Se
Dominant Function: Ni
She very much trusts her instincts. Brea spends most of her time in the library, learning things, and then leaping to conclusions based on the information provided to her. She pursues a quest based on a personal vision shown to her in the library, then follows each subsequent clue along the path, never once doubting that she has the right conclusion, even when her sisters challenge it. In the secret room beneath the throne, she quickly realizes it is a puzzle, and attempts to break the puzzle by selecting stones in the proper order—first, by the importance of the stones, and when that fails, she realizes the end message is that no clan is any more important or valuable than any of the others
Auxiliary Function: Fe
Her is kind and compassionate towards others. She sympathizes with the common people and wants to adapt the values of justice and equality she learned in her books. She is a natural leader of the fellowship and uses her charms to get ahead. Being her mothers favorite child she gets ahead with much and while being rebellious she wants to please her family and be accepted by them.
Tertiary Function: Ti
She suspects someone is trying to erase her memory and switches the cups. She trusts what she reads in books. She sees a wrong and strives to correct it, but she does not always judge the situation well, sometimes getting herself and others into trouble.
Inferior Function: Se
Brea can act impulsive and daring under stress. While she is normally more recluses and hermit like she likes to take action and be involved in the fight against the Skeksis herself and not just standing on the sidelines.
Note: Parts of this argument have been taken from Funky Mbti in Fiction we’re she is typed as an INFP.