I have had a few ideas, but I have never gotten past the creative stage. I mainly though up of objects with unnatural abilities, but now I have this one idea that I think might go over well. I'm not writing this in sand box because this is really just an idea thats needs the ok to enter the next stage, so here it is.
My idea is basically a boy who has been labelled as a legit immortal. Unfeeling and dull, this white haired boy has been said to have lived for thousands of years. Multiple documents and photos through out time reveal that this child has lived far past the normal lifespan of a regular human. I plan on using case files and experiments to demonstrate this SCP's different abilities.
I understand that there is a rule about having uber powered humanoid SCP's (X-man syndrome) examples like Caine and able, but I plan on making his powers more on the side of intrigue rather than some ultimate killing power.
Time would render useless against my SCP, as he doesn't age or grow from his childlike form. My SCP would also have the ability to regenerate lost tissue mass and bone material. This ability would go to the extent of even being able to regenerate from a skeletal form. Fire, electricity and other hazards will damage this SCP and cause pain just as they would to a normal human, but due to thousands of years of life experience, this SCP has been left with dulled/delayed sense of pain. What I hope will be the most interesting part of this SCP is his personality, and the stories he can recollect through his existence.