As he stared into the eyes of a grinning, insane, albeit very attractive jester, hoisting a comically intimidating mallet across her shoulders, he realized that he wasn't in the Department of Mysteries, or London, anymore. But he didn't care. Harry checks into the madhouse, and makes himself at home. Harry/Multi, AU, Powerful!Harry/Hermione.
Crossover - Batman & Harry Potter - Rated: M - English - Humor/Romance - Chapters: 15 - Words: 165,170 - Reviews: 272 - Favs: 1,857 - Follows: 1,934 - Updated: 3/9 - Published: 8/26/2014 - [Harry P., Hermione G., Harley Quinn, Poison Ivy]