SCP Foundation

SCP-30XX is an humanoid

Should be "a", "an" is usually only used when the first letter in the word starts with a vowel.

homo sapiens sapiens species, approximately 1,75 meters tall and having 50 kilograms of weight.

Grammar problems here and it just sounds…off. I'd do something like:

…resembles a human adult male. Object is approximately 1.75 meters tall and weighs approximately 50 kilograms.

I'm going to skim for now. The article is plagued with small grammar errors like this. I see commas being used in measurements (when periods should be used), some sentence structure (Like the one above) just seems…weird to me.

Stuff like this just seems unneeded, I'd say remove this whole sentence.

SCP-30XX also seems to be wearing a white social shirt, black trousers and a pair of black shoes, composed of common fabric, yet unknown brand.

It's not really important to know what kind of clothes this thing wears.

So yeah, definitely go through this a few times to clean up those grammar mistakes. No, concering the article. If you haven't already read it, I'd recommend this essay. It should give you a nice understand on how to write humanoid SCPs.

I'd also spend less time describing the SCP and get to the anomaly quicker. It's not until paragraph maybe mid-way through paragraph 3? I'd say paragraph 4 is when you really start talking about the anomaly, and that's too far in. See if you can cut back on the description a bit, taking stuff out and maybe combining paragraphs 1 and 2.

emerge inside the room.

I feel like manifest would be a better word

Also I'm just kind of confused about the anomaly itself? It's a guy who runs a class room where ghost kids appear? And that's it really? It just doesn't seem interesting enough as is, there's nothing going on to keep the readers attention. Expand on the anomaly more. Try to create a story around it. Why do these ghosts appear? What's the humanoid doing? Create some sort of back story for this thing. As it stands now it's just not that interesting to read.

As I said, I skimmed so I definitely did not catch all the grammar errors, comb through it and clean that up a bit.