Interesting! Hmm, I haven't written any fanfics of my own so I'll mention someone else's!
I'd say Wisteria by MissTeak could be under comedy. It hasn't been updated in forever, but I still love that story!! It's so beautifully written. I think that it has a sense of hope throughout the story between Sesshomaru and Kagome, as Kagome (SPOILERS IF YOU HAVEN'T READ IT) is lost in a different world, with Sesshomaru as the one bright ray of hope she has. Of course she's not all despair all the time, but the underlying fact is that she is trapped and challenged with choices that affect her and those around her. It's like she has to choose to live behind the mask of the geisha or choose to live as herself... Such a well written story...
I think everyone has read this story, but if you haven't, here's the link! It's incredible but be warned, it hasn't been updated in over two years...
dokuga.com/fanfiction/story/1473/1
ADMINISTRATIVE EDIT: Rated MA! No minors, please