If you're looking for anime similar to The Melancholy of Haruhi Suzumiya, you might like these titles.
New meetings always come suddenly! The protagonist, Yuu Haruna, moves into a new town where he meets a somewhat strange girl who doesn't have a cell phone. The girl, Fuuka, seems to have a strange allure that draws people to her, very much like a summer breeze. Looks like Yuu has been caught up in one wild love story!
"Puberty syndrome – Abnormal experiences rumored on the internet to be caused by sensitivity and instability during adolescence. This year, Sakuta Azusagawa, a second-year student at a high school near Enoshima, meets several girls that are experiencing this “puberty syndrome.” For instance, he meets a wild bunny girl in the library. She turns out to be an actress on hiatus, Mai Sakurajima, who is also his senior at the school. For some reason, no one else can see this enchanting girl. How did she become invisible…?
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If you liked this anime, you'd definitely like this one too! Both feature similar protagnists dealing with the supernatural events around them.
In the technologically-advanced Academy City, millions of students study superhuman and psychic powers. Judgment, a group made up of specially-trained students and adults, helps combat threats to the city and its people by helping apprehend power-wielding criminals. Mikoto, Kazari and Kuroko are three friends who juggle school and Judgment, all the while learning how to best use their skills. Together, they will help keep Academy City safe from the bad guys and have plenty of fun in the process.
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Both, Railgun and Haruhi Suzumiya, are more-than-the-average shounen series, that have a bit of everything.
They have a fair share of slice-of-life commedy with main characters, that tend to have somewhat silly habits.
Haruhi Suzumiya features more mystery elements.
Railgun focusses a bit more on action. I recommend watching Railgun before "A certain Magical Index".