If you liked
Koukyoushihen Eureka Seven
|
...then you might like
Guilty Crown
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A teenage boy meets a cute apathetic girl in which they are connected by a red string of fate to these unique girls. The closer these individuals become the more we see how deep of a connection they share. Both series have a mecha theme when on the battlefield
If you liked
Ayu Mayu
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...then you might like
Otomari Honey
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These mangas both contain alot of romantic and comedic cliches that work very well to keep the story interesting. Otomari Honey plot is about the life of four girls living with the male protagonist and one of the girls is in love with the him. Ayu Mayu is about how the male protagonist wants to find his sister(s) and moves in together with possible matches, but not knowing the truth leads him to fall for one of the girls. While these plots are different they both follow a very similar romantic/ comedy stroyline. As well as giving us some great fan service.
If you liked
Pastel
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...then you might like
Parallel
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Both stories and art are done by the person. The setting and storyline are basically the same. Parallel seems to be a short version of Pastel.
If you liked
Rosario to Vampire
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...then you might like
Omamori Himari
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Omamori himari and Rosario+ Vampire (manga) are similar in the fact that they take place in a school setting, one guy has several girls after him, fanservice (ecchi), and plenty of action. Omamori Himari's main heroine is a swordsman (woman) while Rosairo+Vampire's main heroine is a vampire. In each manga they fight demons that are after the male protagonist. Both contain romantic and comedic sences which you can't help but laugh at. The plots between the two manga are very different but if you llike a combination of action, romance, ecchi, comedy, then you should enjoy either of these manga.
If you liked
Shakugan no Shana
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...then you might like
Zero no Tsukaima
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Shana and Louise basically have the same personality. If you enjoyed Shana's cuteness, firey attitude, shyness, and her unawareness of the emotion called "love" you will love Zero no Tsukaima.
If you liked
RahXephon
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...then you might like
Koukyoushihen Eureka Seven
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Quick summary: This was the previous work of the people who did the Eureka Seven anime. Both have music references, mecha, and a love story between the main characters.