I'd like to see if this sounds too powerful, not powerful enough, too boring etc. I'm not going to write this for a while. Yes, I know it's a humanoid and sentient, and there are some traits that it shares with other SCPs
It is a being, appearing human except that people who have seen it do not agree on a gender for it, some going so far as to claim its gender to be different for each viewing. Not that its appearance changes from viewing to viewing, or even person to person. It is just extremely androgynous. It cannot interact with physical objects directly, but it can manifest itself to multiple people, upper limit unknown. And it does like to talk to people, watch what they are doing and learn.
It isn't inherently dangerous to people physically or mentally (as far as the Foundation knows), but could pose a security risk for obvious reasons.
The problem for the Foundation is then containing it since it can move through objects and walls. I was thinking it had to be within X meters (to be decided) from at least one of the people it manifests to. In order to manifest to a new person, it would have to be within viewing distance, if not X meters as well. So you have an entity that is "infectious" but is only a problem if it decides to infest your enemies and have chats with them.
People it manifests to can be any distance apart, and the entity can travel to any of their positions, but must stay within the X meters of at least one person. If all people it manifests to are killed, it will go to (a random person? the next closest individual?)
At the moment, it finds the Foundation "amusing" and sticks around them even when given the chance to manifest to civilians.
Some people find it unsettling, since it tends to follow them. Hence why going crazy isn't an inherent danger, but is possible. It has requested to meet other sentient SCPs. Obviously, some of them will be automatically rejected. But I'm not sure which ones. I mean, they wouldn't have to worry about it getting injured physically, but it could harm or be harmed mentally by other SCPs. And then how do you reliably stop it from manifesting to someone working with an SCP it wants to meet once they get in sight range?
Some of these assumptions will be wrong, so it won't be quite this fluffy in a finished form when I would actually post it. Any ideas for which SCPs it should meet, and which it certainly shouldn't? Maybe some that could have bad results that weren't expected for either? I do have a list that it would request to meet, and if they happen to be in suggestions, that's awesome. How about a basic containment plan?
Sorry if this was long. And still not very detailed. I came up with the idea two days ago and this is most of what I've figured out and what questions I'm thinking about.