SCP Foundation

Number 1 — The core of this SCP is that it is a literal giant living cave. When someone reaches a certain point when walking into the cave, large organ-like materials will start to appear in and out on the sides of it, until reaching the central part of the location — that is, a 15m tall heart suspended on the "roof" of the cave by hundreds of large vein-like material. When you're exploring the insides of this SCP, it begs for you to leave, saying that you're "hurting" it, that it "always hated those pesky creatures" and to stop "crawling inside me". It isn't know if these ''messages'' are telephatic-like or if the SCP is really vocalizating them on some unknown area. It sends deadly white creatures (white blood cells) to try and stop you, like you're an unknown virus. The SCP's exploration logs are the heart of it.

Number 2 — This SCP is a sentient body of water. I still haven't decided if it's a river or a portion of some ocean. It can travel a water current in impressive velocities and it's very intelligent. It apparently knows English and Hebrew and can send vocalizations and talk with researchers, although it complains that we speak "very quietly"; how it does that is unknown. It has several fish-species living inside it and constantly asks for the Foundation for human subjects to "play a little". These requests are always denied. When it's on a good mood, it likes to talk about the "great flood" it helped with several thousands of years ago.

Number 3 — This SCP constantly appears in smalll rural towns. It is a ghostly humanoid headless being, always in a white and black suit, helding a living head by its hair who always has a creepy smile on its face. It releases this head as soon as it confronts a victim, chasing them in high speed while the head laughs uncontrollably. As soon as the being touches someone, the victim ceases all life function in an apparent painless way. It's folklore-based.

Are any of those ideas worth exploring? Thanks for anyone responding :)

1. This could actually be a pretty funny comedic SCP if you approach it as a subversion of the "this is no cave" cliche. Just a voice constantly and comedically complaining about the actions of interlopers, maybe with extremely ineffectual antibodies as a climax.

2. Not as big a fan of this one, as it falls into the "quirky immortal who knows cryptic myth stuff" cliche, which tbf can be done well, but rarely is.

3. This is just the Legend of Sleepy Hollow but in a suit.