Do I need to get permission to write Foundation Tales about established groups/things, such as Nobody? I had a rough idea for a Tale about Nobody, or possibly multiple, but I wanted to get this cleared up before I get started on it.
No. You don't need to contact the author/creator of a GoI/SCP to write a tale about them, but it is wise to attempt to contact them about it, in case they want the GoI to have a strict storyline, and not have whatever added to it.
THIS TIME WITH MORE FIRE!