While Death Note and its characters are often sexist, I adore the series most important female character: Misa Amane. She's cute, obsessive, tragic, and manages to come across as crazy even in a manga where all the lead characters are at least borderline psychopathic. So here's seven fanfiction recommendations primarily centred on Misa, with some Sayu and Rem thrown in for good measure.
Masquerade by
ebony_creme (Sayu and Misa, somewhat Sayu/Misa. Post-series.)
Borrowed Clothes and Fake Jewels (20 Things You Never Knew About Misa Amane) by
feast Sand by
elwing-alcyone (Rem and Misa)
Tempo Rubato by
ebony_creme (Boxing Day shopping was a tradition for Sayu and Misa - it was one of those things that never changed.)
il tango di signora by
feast (Misa dreams)
What Light Doesn't Know by
kerri_is_dead (Sayu/Misa)
A Subtle Kind by
ruriruri (AU, Mello/Misa-ish, Light/Matt)