Nisekoi is one of the most popular harem mangas that are currently ongoing, and even though there are already 90 chapters released, the story is full of mysteries and uncertain facts. In the story we can clearly see how the character design develops as the series progresses, and that the author decided to "readapt" some of the personalities in his characters along the way. But the manga is staying good and enjoyable to read, and it'll most likely remain that way.
Scanlator: Red Hawk Scanlations
Current Progress: Chapter 90
Read Online: Read Online Here
Red Hawk Scanlations are the guys behind Nisekoi, this weekly manga is translated very efficiently and it's rarely delayed. They have their own online reader (linked above), so make sure to go there and show some love.