I'm an older male writer, who has been active in the HP fanfiction world since 2010. I also like Jim Butcher, Garth Nix, P.C. Hodgell, Patrick Rothfuss, and much more.
A variety of crossovers featuring Luna Lovegood. Currently, Discworld, and Superman. Planned are The Raven Cycle, Supernatural, The Dark is Rising, Discworld (again) and possibly The Dresden Files.