Not exclusively for fanfic. Useful for stories, too.
Does Your Story's Sidekick Serve a Purpose?
10 Tips for Giving Your Sidekick Purpose | She's Novel - Will read later.
Hehe my full name is Delaney and it's on there! :p
Season-inspired names from anomalously-written on Tumblr.
Why not spend Friday getting into arguments about alignment charts?
I made a very detailed list of all of the things I like in stories, and I've been trying to incorporate those things into my own works, and I am pleased to say that I've noticed a slight improvement in my writing.