If you liked the Zero no Tsukaima anime, the Anime-Planet community thinks you'd like:
When the students of class 2-A at the all-girls Mahora Academy head back to school, they are expecting a new year as usual. What they get is a new homeroom teacher... who's 10 years old! As if being a genius isn't enough, Negima is a mage. As part of his training to be a Magister Magi, he must succeed at teaching - without anyone finding out he's a magician! Can Negi keep his talents a secret from the girls who just adore the cutest new addition to their academy? Through demon attacks, magical enemies, and English tests, Negi will put all his talents to the test to be the best teacher he can and achieve his goal of Magister Magi.
ZnT and Negima involve magic, a lot of girls, and a main character who is connected to them. Both anime are also very funny and have the same kind of weird humor, while still having a good story. Also if you are into fanservice, both series have plenty of it but in a funny not annoying way.
Both are based around magic, school, and ecchi. Lot's female characters in both shows. And both have people who have no idea about magic learning about it and becoming involved with those who use magic.
Arika Yumemiya is a poor yet energetic girl who has come to the city to become an Otome – a female warrior with the power to match an entire army. She quickly befriends her irritable fellow student Nina Wong and Princess Mashiro, the queen-to-be. With the help of her mysterious benefactor and abundant natural talent, she’s able to overcome the trials of everyday life in the competitive Garderobe Academy, but darker schemes are afoot. How will her new friendships fare, when secrets of the past and present are brought forth to spark a fight for the crown, and more?
If you liked Zero no Tsukaima, I think you would like My-Otome because magical girls are the main aspect of both plots. Both animes also combine comedy, romance, drama and fantasy. Finally, they both take place in an academy-school.
Both Mai-Otome and Zero no Tsukaima have plots dealing with master-servant relations and magic (or high enough technology that it's pretty much magic, in Mai-Otome's case). Both also feature humour, action and small amounts of ecchi. Mostly, they strike me as they would be enjoyed for the same reasons.
Seeking a cure for his depraved masochism, Taro Sado approaches the Second Volunteer Club on the recommendation of his best friend, Tatsukichi. There he finds the help of the violent but kind Mio Isurugi who promises to beat the masochism out of him by any means necessary. Will Taro be able to survive the assaults of this upperclassman, the overly-affectionate attentions of his mother and sister, and still lead a normal school life? Unlikely. But will he get over his perverse fetish? He sure hopes so.
Ouran High is a school for the extremely wealthy or, in Haruhi's case, the extremely talented. But no amount of talent will help when Haruhi accidentally drops an eight million yen vase in a music room. The vase was the property of Ouran High School Host Club, a group of attractive young men who, for a fee, provide their time and affections for their lovesick clientele: the female students. Fascinated by this strange new specimen, a poor and clumsy commoner, they force Haruhi to work for them until the debt is repaid; but they get a lot more than they bargained for...
Granted the theme isnt quite the same, but if you like the kind of humor that is presented in both animes, it will be a great watch! The weirdness levels of both animes are presented in a similair way even though Zero no Tsukaima is more about magic then Ouran High School Host Club, they both have the school life theme and absurd humour to keep you entertained.
Although these anime have an extremely different plot and setting, both of them are still centered around a character that is "out-of-place," and are extremely comic series with a romance happening in the back ground.
Eighteen years ago, the Platinum Tiara, which gives its wearer magical powers, was reassembled. At the same time, five "Princesses" were born, to the worlds of Earth, Heaven, Celestrial, Fairy, and Hell. These five princesses quit maturing at the age of 10, and are all competing to become THE Platinum Princess so they can grow up. This story is centered on Yuuchi, from the kingdom of Earth.
Both deal with a fantasy realm and include things such as humans, elves and other fantast beings co-existing. Each anime has its plot twists and are both similar in their sense of genre. If you enjoyed one, you are sure to enjoy the other.
If you liked the European-esque Medival type stuff with dragons and magic with romace these two animes are for you. They have different stories and characters in a lot of ways but still are very similar.