If you're looking for anime similar to Denpa Teki na Kanojo, you might like these titles. All recommendations are made by Anime-Planet users like you!
Although both DTNK(denpa teki na kanojo) & BS(bungaku shojo) are of totally different plots & genre they are similar in their somewhat dark romantic feel. The female leads were initally looked as weird characters but as soon as story flows both of them makes the veiwers become attached to their roles. if you are like one then you will surely like the other. ^_^
The girls in both shows are batshit insane. If you have a things for girls with abnormal personality, and amount of loose screw in the head, check both show out, seriously.
Denpa teki na kanojo, you know the drill, is a mystery anime with girls killing and dying. That's enough for you to guess what kind of girls will pop up in the show. If you are surprised by the girls in this show even when acknowledging its plot, then watch something beside Naruto and come back later. I recommend you googling 2 girls 1 cup though, for instant vaccine to this kind of characters.
Danshi koukousei no nichijou, literally: daily lives of high school boys. This one is tricky, but look at it this way, you have seen harem anime that give 100% attention to hot chicks and 0% to the male right? The one that male characters have no personality whatsoever. This things work other way around in DKNN.
The boys here are more prominent and the girls are intentionally made into a dummy character with one emotion. You will see most girls doing the same stuff all the time. Why? Because we are not following them all day long, the anime only show the batshit insane side of them in order to make jokes. Because they are joke characters and not a central interest of the show, whenever they show up, it's goofy time.
But here comes the promise: if you have a refined (aka. fucking perverted) taste for girls and want to sees girls with crazy emotion, and ONLY crazy emotion, this is a show for you. Whenever girl A shows up: SUDDENLY MIRAI NIKKI, whenever girl B shows up: SUDDENLY SCHOOL DAYS. Well, something like that.
And for those who read till the end, thanks for reading, and do not google what I told you to, seriously, SERIOUSLY. I said that twice because it's important.