One of the many, many fics originating from Space Battles.com, My Enemy, My Friend (written by K 9 Thefirst 1) is basically a more coherent take on the same idea as the Round Robin NGE: A Little Angel On My Shoulder, i.e., after getting killed, the angels end up as tiny versions of themselves who follow around the pilots who killed them. Unlike its crackier sibling however, it has both a coherent plot and excellent characterization, although some of the latter isn't exactly what you'd expect. Notable for being one of the very few works that manage to make the angels sympathetic, mainly by showing things from their perspective. Although still early days (only one angel has actually been dispatched), all the signs are good.
Tropes present include: