If you liked the Princess Lover! anime, the Anime-Planet community thinks you'd like:
Fifteen-year-old Tsukune Aono is average in every way; he has no hobbies, less-than-stellar grades and he's even flunked his high school entrance exam. His parents have managed to enroll him in a school, but it's no ordinary school! Tsukune will be attending the Youkai Academy, a place where monsters learn how to co-exist with humans! As the werewolves, vampires, witches and other monsters are required to retain their human forms, Tsukune - the lone human - is able to avoid their bloodthirsty gazes. However, he quickly attracts the attention of a number of devilish beauties including the vampire Moka, a busty succubus and even a young witch! It seems Tsukune's average life isn't so average anymore!
If you like girls like Charlotte, you'll love Rosario to Vampire.
Rosario to Vampire is also a romance harem anime except the protagonist isn't one of the wealthiest people in the world and it's based more on fantasy.
Kaede is a devoted high school student who lives with her adopted brother Rin. She holds a quiet confidence that one day, when Rin finally starts showing interest in sex, he will make the obvious choice and turn to his loving sister. But what Kaede wasn’t counting on was the lords of heaven and hell coming to Earth, wanting Rin to mate with their nubile daughters! Rin, like any teenager would, takes full advantage of his newly acquired harem; but how long can he keep up his carefree, boxed-lunches-on-the-rooftop lifestyle, as the horde of girls on his tail grows?
Well, there shouldn't be much further explanation required. Both Princess Lover! and Shuffle! are largely set in a school, both are about a guy pursued by several nubile young ladies and both promise a heaping helping of ecchi humour. Although Shuffle! featured nudity and a storyline, while Princess Lover!'s story is mostly absent and it doesn't yet appear as though anyone's going to get their tits out, they're still similar enough to pair up like this. Also, both titles end with an exclamation mark.
Ever since their first meeting at six years old, Hikari Hanazono has struggled to defeat her rival Kei Takashima at anything, whether it be athletics or academics. To date she has proven unsuccessful, resulting in Kei constantly referring to her as "second place." In reality, Kei has been in love with Hikari for quite some time, but Hikari remains completely oblivious to the fact. Now, as the top two students in a prestigious academy, the duo continues their long-running competition as part of the school's elite class of seven, the Special A. Will Hikari ever surpass Kei... or realize that he loves her?
Take Princess Lover!, keep the rich people and (pointless) school clubs, replace the harem and ecchi part with some romance and you get Special A (more or less). So if you thought that the setting featured in Princess Lover! was interesting, but couldn't stand the rest of the crap it came packed with, you might as well enjoy watching Special A.
While these shows differ a lot in plot, they are both essentially ecchi harem shows filled with fanservice where a dull male lead is courted by a bunch of female characters for his standing in his respective field. They both happen to be based on VN's made by the same company, so they have a very similar tone and feel to them, as well as the character designs having a similar look to them.
If you did enjoy one of these then the other is probably the type of thing that would interest you somewhat.
It is a time of peace between the Earth and the Moon, in the aftermath of the great war between them. On Earth, young Asagiri Tatsuya is amazed to learn that his home is to have a Lunar exchange student, for a homestay guest. Even more amazingly, his guest is none other than the Princess of the Lunar Sphere Kingdom, Feena Fam Earthlight. As Tatsuya struggles to deal with the ramifications of this, and as tensions rise between Earth and Moon, he also learns that there is more to this homestay than meets the eye, and that he and Feena have a shared destiny...
Suddenly males experience firsthand both a new environment and way of living (the world of the wealthy/the moon), becoming directly involved with royalty and other highclass individuals who are a part of this different lifestyle. A love interest for the protagonists is a kindhearted princess engaged to a fiancee who is plot important.