Name: Maiden
Long white hair. Purple inner color.
White off-the-shoulder top and a long skirt.
Governs the Void. (Nothingness and Imaginary Numbers)
She looks out for Guest, the youngest sibling.
That said, she wants you to stop observing her.
It seriously hurts.
It's not like she'll disappear if everything is observed,
but it really hurts.
To teach a lesson, she pours Void power into Guest to short-circuit their brain and stop/reset the observation.
A sadist.
By coating her finger in the Void and inserting it into Guest's brain,
she can peek at the results of the observations Guest has made.