If left unchecked, SCP-049 will generally attempt to kill any such individual SCP-049 contact. SCP-049 will become hostile with individuals it sees as being affected by the Pestilence, often having to be restrained should it encounter such. Although the exact nature of this Pestilence is currently unknown to Foundation researchers, it does seem to be an issue of immense concern to SCP-049. While SCP-049 is generally cordial and cooperative with Foundation staff, it can become especially irritated or at times outright aggressive if it feels that it is in the presence of what it calls the 'Pestilence'. SCP-049 is capable of speech in a variety of languages, though tends to prefer English or medieval French.

X-rays indicate that despite this, SCP-049 does have a humanoid skeletal structure beneath its outer layer. While SCP-049 appears to be wearing the thick robes and the ceramic mask indicative of that profession, the garments instead seem to have grown out of SCP-049's body over time, and are now nearly indistinguishable from whatever form is beneath them. SCP-049 is a humanoid entity, roughly 1.9 meters in height, which bears the appearance of a medieval plague doctor.

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