Fascinating. I love it.
I think this could use a bit of editing, mainly because it claims that we don't know anything about possible intelligence or sentience in two-dimensional beings, which seems to be in direct opposition to SCP-085.
Each SCP is to be taken on its own.
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Also keep in mind that in-universe, we don't know when this SCP was catalogued or last updated. It could have been decades ago. Or the research team might not have clearance to know about SCP-085. Of course, either way, there is no canon.
Assuming that this SCP does not change it's appearance and that it was created by a human, the artistic style and ink colors used would give an estimate of it's origin date. I am no expert on tattoos, but the one in the photo seems more modern than the earliest days of the Foundation. Which brings up a question I have. When was the Foundation founded? I have seen references to SCPs being first noted in 18XX.
Heh, up-voted if only for the creepy subtext in 'Transfer is more complicated in deceased subjects'
I like the terrible choice present for a D-class host: You get to avoid monthly termination, but you're locked up with an excruciatingly painful tattoo.
Very nice, unique entry. The only problem I have is why must tattoos for the purposes of feeding be applied quickly?
Possibly because 021 might attempt to eat it before it is finished. Which might be a problem or it might not. Maybe if the food isn't finished, lines that have not been completed (gone in a full circle. Think of a half-completed apple or orange. It would form a sort of semi-circle which would have two ends of the line) are "sharp" in a 2-D world and would pierce 021, potentially seriously wounding and/or killing it.
I really like this one. The only issue I have is the line that the hosts death doesn't seem to affect that organism. If the tattoo feeds on melanin, wouldn't it run out pretty quick when the host dies? I know it could be transferred from dead to living, but I'd think the death of the host would eventually starve the tattoo.