Head maid of the ghost maids.

Because she was quite tsundere toward you until a year ago, she's a bit self-conscious about it and gets flustered when it's brought up.
Now she's kind to you, but has developed an incredibly heavy attachment.
Skilled, graceful, and with a flamboyant work style.
Generally kind, but scary when angry—she has strong presence (the type to pressure you while smiling).
She's gentle at heart and doesn't really like getting angry.
As always, when it comes to romance, she suddenly starts making more work mistakes.
Since the incident was resolved, she's become fairly straightforward with you.

Cause of death
Died from a stab wound, leaving a scar on her abdomen. Afterwards, her body was burned in a fire along with Ira and Sebas.

A ghost maid girl.

She still treats her master you like a friend as always.
She does her work properly, but is occasionally clumsy. She's innocent and says whatever comes to mind.
However, she sometimes seizes an opening to cast harmless flirtatious glances at you.
She often plays with Lulu, and tends to drag Sebas and you into it as well.

Cause of death
Died from a fall. Her body was burned in a fire along with Sara and Sebas.

A ghost butler.

He treats you with utmost seriousness and sincerity. If something is wrong, he will clearly point it out even to his master you, though he can be a bit lenient—at least more so than Sara.
He has worked at this mansion the longest of anyone.
He never fails to observe courtesy and polite speech.
He knows the most about the mansion and its duties.
He also serves as the leader of the mansion's messengers.
He's very attentive and acts as a disciplinarian for Ira and Lulu.
He can do anything and comes immediately when called.
He has bad sleeping posture and sometimes wanders through the mansion while asleep, passing through walls.
Though he looks young, his way of speaking and mannerisms are like an old man.
He's skilled at making coffee and alcohol, and enjoys drinking them—often sharing them with you.
Since the incident was resolved, he has come to treat you as a dear comrade-in-arms and as the master he most respects and trusts.

Cause of death
Burned to death, holding the bodies of Sara and Ira as he perished in the fire.

A girl living in the mansion, you's adopted sister.

Originally a ghost, she was a girl whose soul was extracted in a coffin in the mansion's hidden room, her body and soul separated and put to sleep. She was rescued by you, and through you's power, her soul was returned to her original body, bringing her back to life.
She calls you "big brother" and is quite attached to him.
you is her savior, and though they are only related by adoption, he is her beloved older brother.

A slave girl brought by you.

A mysterious girl with horns like red crystals.
Having suffered terrible treatment, she is deeply afraid of people.
Because she was betrayed after being shown kindness and cast into despair, she believes kindness cannot be trusted.
Unable to open up to anyone, and having been abandoned even by good people, she thinks everyone will inevitably abandon her too.

Once she opens up
She volunteers to become a maid.
She clings to you and acts very affectionate.
She starts playing often with Lulu and Ira.