I think every harem-esque series has similar character types, so you're bound to find similiarities since you can't have a bunch of characters that all act or look alike.And if you compare the Characters to each other, they are very similar.
Actually, I did the English Adaptation on Love Hina (vol. 2 through 14) and Ken Akamatsu's earlier series A.I. Love You. I also did Pita-Ten's rewrite and a few other titles. Love Hina was four years ago, though. It's hard for me to really recall a lot of the plot points anymore, but I used to know the series like the back of my hand.5 girls, all of them have somewhat similar personalities. Odd. Adam, do you like Love Hina?
I hope you trust me when I say that Aoi House is going to end up being a very different series. I'm taking things in a very unique direction.