X Beatrice

Mugshots/X Beatrice.png|X Beatrice.png

This is the human Beatrice in ordinary clothes that is seen in Turn and Alliance.

She is an orphan from Fukuin house, Sayo's ally, and the 19th person X on Rokkenjima.
She is the model for the Beatrice portrait.
She murdered Kinzo some time before the tragedy.
She does not identify as Beatrice, and this extends to the red truth.
She was personally hurt by Battler's sin.
There's a chance that the character of Gaap represents her.

See this chapter of main theory document for all the details.