Unit Zero

Lieutenant "ZERO" is an NPC character that is part of the Mobile Task force of O5-10's personal escort and bodyguard unit, referred sometimes as "MTF A1-10: Knotty Moot". She is the toxicity and ambiental specialist of the team.

Description
ZERO rarely takes off her mask, even out of mission. When she has, she is a tall dark skinned woman with short hair. She has never been a very talkative type, but participates in conversations when asked to, or included.

Her uniform is fireproof, and sealed to outside elements that could affect combat.

As the rest of the Task force, she is a skilled an loyal combatant, specializing in fighting through climatic or biological hazardous scenarios, natural or artificially made.

Backstory
As all of the members of MTF A1-10: Knotty Moot, ZERO had a problematic file and was an underestimated combative member, usually called unreliable.

[...]

Unit ZERO, despite her excellent scores and incredible resistance to outside effects during training and combat had an issue with self control and following authority. Incidents of her setting things on fire casually, despite never really making an area or wind collapse, made her be usually be taken aside as a backup unit, and tainted her record and chances of improving in the ranks.

Despite this, and how she showed unwavering loyalty to the foundation, she was kept within it. When interviews to a "special unit" were held, O5-10 found her stable and reliable enough to be part of his escorting unit.

Apparitions
ZERO's first appearance was when O5-10 arrived with his fully selected unit a few weeks after being made O5,and had not been seen before hand.

Her other important appearances have been when the task force moves to escort O5-10 or one of his clones around, and when they gave Ten ideas to better himself without thinking only of SCP-6740.

During Ten's visit to SCP-10000, she was the only MTF member who stayed by his side and did not go into hiding when the anomaly peeked into the room.

Trivia

 * She is a pyromaniac who is trusted to please, please keep under control unless under attack.
 * Yes, she plays TF2
 * She is the one who came up with the MTF name, just for fun.
 * She doubts she is actually stable enough for this unit.
 * When she feels too pyromaniac, she usually sets nearby small things on fire, like cups, paper, pens, plastics or even plants.
 * This is why Pyro is rarely called into O5-10's chambers or office, since he fears she'll set on of his books on fire.
 * Or him.