Here's a few guides / resources that I use often that aren't game specific.
- Need a name? Check out Behind the Name! It has a lot of names from different cultures, and you can even search by meaning/themes (you pick a few terms, and BtN will grab names with any of the strings) or local. There's also a randomiser.
- Need a prompt? A character idea? Anything? Seventh Sanctum is a generator site. For just about anything that has to do with writing.
- Need to make sure your character is not a Mary Sue? Take the Mary Sue Litmus Test!
- What is God-Modding and Why is it Annoying? Also - how to avoid metagaming.