Per 
Object #: SCP-???? (one of the 5000s idk)
Object class: Euclid
Special Containment Procedures: SCP-XXXX is to be kept in a 5 m x 5 m Moderate Security Cell in site [not yet defined]. Personnel may only enter its containment in groups of 2-3, and are to be accompanied by at least 3 other staff members. As of November 1, 20XX, personnel are NOT to enter SCP-XXXX's containment, as they may be subject to mimicry, resulting in difficulty distinguishing between staff and SCP-XXXX, and possible death or a breach. It is to be fed a standard diet of rice, two (2) Type-C meal bars, and 1L of water at least once per day, and nourishment may be provided through the small metal hatch adjacent to the one-way window that allows researchers to collect data about the entity without being risking imitation.
Description: SCP-XXXX's true form is unknown; its "dormant" form is of an Caucasian female humanoid with straight red hair, appearing to be about 13-14 years old, though the true age of SCP-XXXX is unknown. (The object insists that is its true form, though this has since been disputed, as the person SCP-XXXX claims to be was found dead at the age of 20 in XXXX County, Salem, Massachusetts, on October 30, 1932, due to a mysterious shed fire, yet evidence from the [DATA EXPUNGED] Dossier suggests that it has existed before 1912. The entity has expressed great annoyance at researchers when told this information, and continues to stick with its claim.)
The entity has been shown able to modify its physical appearance to match people and animals it has seen by liquefying and solidifying its body, often transforming into different staff members it has interacted with before November 1, 20XX, and mocking them. It has not currently been observed mimicking non-organic objects. (See Addendum XXXX.1.) It can also slightly alter its appearance to match what it deems attractive, having been observed standing in front of the mirror in its cell, "testing out" different body features, including height, skin tone, hair color, and facial structure, apparently to "see how pretty she can get", as described by Dr. XXXX Foster. (Note: As of January 3, 20XX, this mirror has since been removed.) The entity always returns to its initial form eventually, followed by a 1-2 hour rest. It has been noted that these actions seem to drain its energy.
SCP-XXXX has repeatedly asked researchers to call it "Alex", though this request is usually ignored. One exception is Dr. Foster, who has been known to express high amounts of sympathy and care for SCP-XXXX, often reading stories and telling jokes to the entity through the intercom. The Foundation has considered disallowing this behavior, as it affects her productivity and motivation in regards to research of other anomalies. As of January 1, 20XX, Dr. Foster is no longer allowed to work with SCP-XXXX.
"I just don't understand why everyone treats these kids like prisoners. Most of them have never even done anything wrong. They're different, yes, 'anomalous', as I'm supposed to call them, but they have feelings. They deserve just as much happiness as any human child." -Foster
No, they do not. They are anomalies, not human beings for us to get attached to. Keep this up, Foster, and you won't get to work with that thing anymore. -Beux
Stop meddling with my paper, John. If you want to discuss this with me or Foster, you can do so privately. -Caign
[Doctor Beux is no longer allowed to edit this page. Both doctors have received repercussions for discussing trivial matters on official reports.]
Addendum.XXXX.1: SCP-XXXX has been observed experimenting with its body, appearing to test its own limits regarding its shape-shifting abilities:
