Here's a rec, and it's amazing, the best one I've found so far. So lovely and in-character and just really, really well written. It's a WIP, but she appears to be updating regularly.
I can't get the lj-cut thing to work (if the HTML has changed, please let me know how to do it), so I've stuck the link at the bottom.
Title/Author: The Name of the Star is Wormwood by LusBeatha
Fandom(s): Good Omens
Rating: Teen and up