Queen Theresa
"You cannot call Setie a crybaby anymore. "
After her father died leaving her an orphan, Miranda travelled to Deningrad, likely entering the royal guard. At some point she was offered a position in the palace. She accepted and was adopted by Theresa after she became a Sacred Sister. Theresa was the mother she never had and because of this, Miranda is overly protective of her. Theresa is her confidant and source of her strength.
Second Sacred Sister Luanna
"I was surprised too. However, I don't see any falsehood in their heart. "
Luanna and Miranda do not interact much during the game however it is obvious that they are the leaders of the sisters. Miranda's anger contrasts to Luanna's composure. Luanna likely keeps Miranda in check. What Luanna's duties are is unknown but it likely deals with her ability to see into people's soul and help heal their pain. It is not discussed if Luanna has been helping Miranda to forgive her mother and let go of the anger within her but given Luanna's personality, it's likely she's been trying to.
Third Sacred Sister Wink
"Oh, you are wounded!! Please let us treat you at the castle!"
Wink spends much of the game travelling Endiness and she does not spend much time with Miranda. After she saves Lloyd from Dart's attack, Wink stays in Deningrad as her wound heals. The sisters and Theresa are seen during the ending at Wink's bedside. Even though Wink protected a man that had kidnapped Theresa, Miranda had no ill will towards her. It was obvious that Wink had fallen in love with Lloyd and Miranda was able to understand that. It is unknown what Wink's duties are, though it is possible she is some kind of ambassador.
Fourth Sacred Sister Setie
"Sister Luanna can see people's souls! But, she can feel their pain too."
Miranda and Setie don't interact much during the game. Miranda spends most of her time with the party while Setie remains in Deningrad with Luanna. She does call Setie a crybaby even though Miranda herself has been known to cry over the Queen. Miranda is likely hard on Setie, trying to help make her stronger in order to protect Theresa. At the same time, Setie likely looks up to Miranda. It is unknown what Setie's duties are outside of helping Luanna.
Princess Louvia and Shana
At the time of Louvia and Shana's birth, Miranda would have been 12 years old. It is likely she did not live at the palace yet and did not meet either of the girls when they were infants. As Shana was hidden by her mother's midwives, no one was aware of her existance or her connection to royality. By the time Miranda comes to live at Crystal Palace and certainly by the time Shana returns to Mille Seseau, the Queen had accepted the loss of her child and there was no reason for anyone to believe Shana might be Louvia.
Information about Louvia comes from my translations.
