Bijou

Bijou is a body-snatcher working as an undercover agent for the Wardens.

Appearance
Initially appearing as an ordinary looking, if nerdy, woman wearing a full face mask, Bijou's true appearance is that of a doll-like figure, with a large stream of mixed appendages that resides within the normal looking body.

Abilities and Powers
Bijou is a body-snatcher, she can take over recently diseased corpses and maintain them in a lifelike state.

Background
Bijou triggered as a young child.

She was accepted into Case 53 community, despite not technically being one.

Post-Gold Morning
She, presumably, enjoyed the Amnesty.

The Wardens provided her with a new, guilt-free body, and offered her a job.

The Ice Breaks
Bijou attended emergency power testing of Case 53s, arranged by The Wardens.

She infiltrated the patrol-group departing to the The Mall Cluster' dreamscape, alongside Matryoshka. She was preparing to alter power connections related to Case 53s, but was dissuaded from it by Rain.

Trivia

 * Bijou is very similar to a Word of God character, called the Locked-in Girl.