Its physical appearance varies, with dark formalwear being the only constant between manifestations. SCP-4999 will manifest only in the presence of one solitary human person at a time. All subjects recorded to date have been in terminally poor health, critically injured, or on their deathbeds, with SCP-4999 appearing nearby and within sight of the individual. SCP-4999 will only appear if the subject is conscious and alone. SCP-4999 will then remain with the subject, silent and unmoving.