If you liked the The Melancholy of Haruhi Suzumiya anime, the Anime-Planet community thinks you'd like:
It’s a new year, and a new group of students is moving on to high school. Takaki Kono is a shy young man who has a variety of friends including the perverted Yuuji and overly-emotional childhood friend Konomi. Along with the usual responsibilities of attending classes and studying hard, Takaki finds himself involved in the lives of many young ladies as well. Whether it’s with class representative Komaki, wealthy and combative Yuma, Yuuji’s confident older sister Tamaki or yet another girl, Takaki finds himself always caught up with a new girl and a new challenging or playful experience!
Weird quirky characters surround both of these anime and a similar theme of alien catching or being obsessed with them. To Heart 2 is more just a guy spending time with all these different girls who like him and very light hearted. Where The Melancholy of Haruhi Suzumiya takes things in a spastic confusing way and isn't to tender loving. I suggest you check either of these out if you liked the other.
Sunao Konoe has just transferred to a new school and quickly makes new friends in the flirtatious Shinichi, loud Kinu and other classmates, but what she really wants is to form a theater club. There’s just one problem: the student council has to approve any new clubs, and the group is led by Erika, an arrogant girl who refuses the request! With distractions such as her childhood friend Leo, part time jobs and Erika’s outlandish challenges standing in her way, will Sunao ever manage to form the theater club?
Establishing her own club in school is her dream, so she needs some followers to make commonition. This is the goal of main character of both of these series. Lively, vivid, extremely energetic, no one can keep up with her - this is just how both of them are, so if you liked one you will find yourself falling for another too.
Ataru is one of the most desperate womanizers alive, and a man whose life is about to become complicated. When aliens invade, he discovers he has been chosen at random to be mankind’s defender, and must play a game of tag with the beautiful alien princess Lum to decide the fate of the planet! After chasing her with all of his crafty techniques, Ataru finally wins, but his victory also means he must marry the princess herself! Now, with strange alien visitors and a jealous wife to handle, Ataru still manages to keep an eye on his ultimate goal: having his own harem!
Urusei Yatsura and Melancholy of Haruhi Suzimiya are both lighthearted school comedies full of aliens, and strange occurrences. Both of these anime feature powerful female protagonists who only seem to cause trouble for the unwilling recipients of their affections, though for very different reasons.
Kimihiro Watanuki is cursed with the ability to see evil spirits known as Youkai. Due to this power, the Youkai are attracted to him like a magnet, and each time he is close to being devoured. One day, fate drew him to a strange store and there, he met Yuuko, who was dressed in a very exquisite fashion. As destiny would have it, Yuuko has the ability to save Kimihiro from seeing the Youkai, but for a price: Kimihiro must work for Yuuko by performing chores around the store and other odd tasks, until she deems fit. With his "friend" Doumeki, and his secret crush Himawari, they will discover that the world they live in is nowhere close to ordinary!
These shows look like they were based on a similar concept, but play out in two different ways. On one hand, Melancholy of Suzumiya Haruhi is an insane comedy; on the other hand, xxxHolic has a big dose of comedy, but can be quite serious too. The main male characters from both shows constantly get involved in supernatural events. In both cases they are not the source of the events, but the situation feels different in MoSH because of the title character. Some ideas in the construction of these two shows look similar (there's not enough space to discuss that, though ^^), yet they are still different. I can't guarantee that you will like one if you liked the other, but try it anyway.
In a world where magic is a reality, the young Louise is at the bottom of her class. Dubbed "Zero" by her classmates at Tristein Academy (due to her zero success rate for magic), Louise (along with all first year students) was charged with summoning a familiar; and instead of a cute magical creature, the familiar arrived in the form of... Saito Hiraga, a normal Japanese boy who was abruptly teleported from his own world?! Can both Louise and Saito come to terms with their new and complicated "relationship" and (more importantly) help Saito find a way home?
Both stories revolve around a girl who is looked down upon by her peers and find enjoyment with the main guy character. Both are in school settings, even though Zero no Tsukaima is set in a school of magic, mysterious and supernatural events occur in Suzumiya. Many of the characters share the same personality traits as well. Louise and Haruhi are bossy. Both Saito and Kyon are forced in some sense to be with the respective female protagonists.(FYI, not in forced in love, I couldn't find a better way to word this)i Also minor characters are very similiar too. Overall, both are very good and comedic animes.