Aldir is a character designed for the game design project Lilyveil. 

Here is her character description from the Lilyveil artbook:

Aldir is the kind and gentle princess of her snowy mountain village. Despite being chosen by the spirits to be the ruler of her village, her soft spokenness and her naivete leave her barely in control of her own choices, let alone those of her village. Every day Aldir strives to find a way to prove herself, so her people will finally take her seriously.

Aldir joins the party during the final act, offering to help them on their journey out of both kindness, and a desire to prove her worth. Aldir is the rightful holder of the final key to unlock the fountain of immortality, but she’ll need the help of her new friends to gain her confidence as a leader. Aldir’s design is inspired by an ermine.

Aldir’s lyre was passed down to her as a gift from her mentor, the old leader of her village.