We've got perfectly good recommendation and story search threads for this. -_-
The Broken Tool
Haku is alive, barely, after the battle at the bridge. With his master, Zabuza, dead and a team of vengeful hunter ninja close on his trail can he hope to last long? Haku X female OC. Please read & review, all comments and advice are appreciated.
Rated: Fiction T - English - Adventure/Romance - Haku, Inari - Chapters: 23 - Words: 169,172 - Reviews: 242 - Favs: 238 - Follows: 105 - Updated: Aug 16, 2008 - Published: Jan 14, 2007 - Status: Complete - id: 3341405
Probably the best of it's kind. Even by today's standards I consider it a good story so it's aged well. The sequel's ongoing and updates semi-regularly.