Item #: SCP-3537
Object Class: Euclid
Special Containment Procedures: SCP-3537 is to be contained in a standard humanoid containment cell in Hall 8 of Site 13. SCP-3537 is allowed access to paper and various writing material after it changes its appearance. All documents written by SCP-3537 are to be stored in a file in Doctor Marai's office.
In case of a containment breach from SCP-3537 in which its current appearance is unknown, all exits are to be blocked off and personnel must take off any clothing article that covers their upper body. Once SCP-3537 has been identified, it is to be sedated and brought back to its containment cell.
Description: SCP-3537 is a humanoid polymorphic being. SCP-3537 has shown to be incapable of controlling its transformations. These are usually described as painful depending on how drastic the changes from its previous alteration are. The shortest time elapsed between physical changes recorded has been 24 hours, while the longest time has consisted of 30 days.
The only recorded aspects that persist between these conversions are SCP-3537's mental characteristics (memories, health, and personality) and a tattoo located in its back between the shoulder blades, which reads "Mr. Shapey, from Little Misters ® by Dr. Wondertainment".
All of SCP-3537's transformations take the appearance of non-anomalous human individuals. Some of the recorded changes have consisted of:

Gain and loss of fat and muscle mass1
Height ranging from 1.56m to 1.97m
Ethnicity and skin color2
Hair color3
Sex
Biological age
Overall DNA structure

Occasionally, SCP-3537 will write down a description for possible anomalous abilities the transformation could have. Testing indicates that SCP-3537 does not obtain the anomalies written.
For a list of some recorded transformations, see Addendum 3537-A.
Shortly after containment, SCP-3537 changed appearance into an obese male of indeterminate descent. Pigmentation was present in the general area of the belly of SCP-3537. The pigmentation took the shape of sentences, and it read as follows:

Markings present on SCP-3537

– hide block

Wow! You've just found yourself your very own Little Mister, a limited edition collection from Dr. Wondertainment! Always wanted a tall friend who could help you retrieve all those frisbees stuck in the roof of your house? Or smart friend that can help you with your homework so you can have more time to play? Well, you're in luck! Mr. Shapey can be that and so much more!
Find them all and become Mr. Collector!!
01. Mr. Chameleon
02. Mr. Headless
03. Mr. Laugh
04. Mr. Forgetful
05. Mr. Shapey ✔
06. Mr. Soap
07. Mr. Hungry
08. Mr. Brass
09. Mr. Hot
10. Ms. Sweetie
11. Mr. Life and Mr. Death
12. Mr. Fish
13. Mr. Moon
14. Mr. Redd (discontinued)
15. Mr. Money
16. Mr. Lost
17. Mr. Lie
18. Mr. Mad
19. Mr. Scary
20. Mr. Stripes

Addendum 3537-A: The following is a list of some of the recorded SCP-3537 transformations accompanied with anomaly descriptions.

Date: 7/12/2016
Transformation #: 3537-26 ("Mr. Night")
Description: Male of Peruvian descent. 1.80m tall and weighted 70.11kg. Bald. Between 30 and 40 years of age.
Other Notable Features: SCP-3537 had pigmentation on its body resembling traditional indigenous body paint. These do not seem to play part with SCP-3537's descriptions
Possible Anomalies: While in the dark, the entity would have manifested bioluminescent spots on the skin. The spots would have acted as stars and their position would shift to match the entity's current location.

Date: 11/6/2016
Transformation #: 3537-89 ("Ms. Sandy")
Description: Female of European descent. 1.63m tall and weighed 63.44kg. Blonde hair. Approximately 20 years of age.
Other Notable Features: SCP-3537 presented signs of constant sun exposure except for the general area of the torso. This 'untanned' portion indicates the use of a one piece swimming suit.
Possible Anomalies: Unspecified amounts of sand would manifest periodically in a small area around the entity. If a subject under 18 years of age were to interact with the manifested sand, any structures created (i.e sandcastles) would become indestructible, regardless of pressure applied.

Date: 5/28/2017
Transformation #: 3537-433 ("Mr. Zippers")
Description: Male4 of unidentified descent. 1.73m tall and weighted 32.02kg. Approximately 50 years old.
Other Notable Features: SCP-3537 presented light purple skin colouration with golden stripes present in a seemingly random pattern across the body.
Possible Anomalies: The entity would consist of a sentient, hollow, humanoid cloth doll, with various zippers around its body. These zippers could be opened into a pocket dimension. Items could be stored and retreived from the inside the entity.

Addendum 3537-B: The following is an interview which took place on 4/19/2018, between SCP-3537 and Researcher Harling.

Interviewed: SCP-3537
Interviewer: Researcher Harling
<Begin Log>
Researcher Harling: Good afternoon, SCP-3537. Today I would like to make some questions about these "special" transformations of yours.Researcher Harling: Let's begin then. Why is it that you only come up with these descriptions of anomalous behaviour for certain transformations? Why not all of them?Researcher Harling: I'd say a polymorphic entity is eye-catching as it is. Do you feel unsatisfied with your anomalies in comparison to that of others from the collection?Researcher Harling: Then what's the purpose behind the notes we've seen you write?Researcher Harling: Brainstorming? What for?Researcher Harling: So what you are saying is that you were the first one that came to existence?Researcher Harling: Any particular reason behind that choice?Researcher Harling: To end it up for today, could you elaborate on why you keep coming up with these descriptions despite not working for Dr. Wondertainment anymore?<End Log>

Footnotes
1. How SCP-3537 obtains this additional matter, along with how it disposes of it, is still currently unknown.
2. There are recorded cases where transformations include various skin pigmentations. These pigmentations usually resemble tattoos and/or cosmetics.
3. Similarly, there are cases where transformations have unnatural hair colors. Said hair shows no evidence of it having been dyed.
4. It's theorised that the entity in question would have been genderless, in a similar matter to SCP-905 and SCP-629, but the transformations SCP-3537 goes through seem to be unable to remove its sexual organs.

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