Haru IS best girl. Not just best Onadera. but best girl.
Ruri is fun to watch, and she's also half of the best pair in the series.
I personally find Marika annoying, but that's just my own personal preference. She is really cute though when she starts speaking kansai-ben.
Well, next chapter should be interesting at least. Unfortunately, I doubt Chitoge will just sit there and let Marika have All the spotlight.