I think I'm one of the few people who couldn't get into Nisekoi. Some of the humor was good but the actual story felt very contrived to me. I read the manga for awhile and then watched the anime for awhile but neither one hooked me.
I've started rereading Ore-sama Teacher. It's one of my favorite manga. Mafuyu is such a fun character.
It's about a girl who was a legendary delinquent in middle-school. She was so strong that she unified the region and had a group of followers. After her last brush with the law and being expelled, however, her mother had enough and sent her to a private school in the mountains. If she got kicked out there, she would be disowned (or worse). Mafuyu decides to take this chance to be a 'normal girl' like in shoujo manga. Unfortunately, it turns out that someone at the school knows about her past and isn't afraid to use her as a pawn in their own game.