If you liked the Denpa Kyoushi manga, the Anime-Planet community thinks you'd like:
With a history of leading a motorcycle gang and getting bad grades in school, why would 22 year old Onizuka ever want to become a teacher? Is it to educate young minds or spread the joy of education? Sure, if it involves being able to look up high school girls' skirts! Watch as this would-be educator uses his own life lessons and unconstituted methods as a means to control a delinquent class of students -- students who certainly aren't as happy to have him as a teacher as he is happy to be teaching...
It's quite obvious that Denpa Kyoushi was inspired by GTO. The biggest change between those two is the fact that they replaced the ex-biker teacher with an otaku teacher. GTO is probably the better one among those two, so you might want to check it out if you like Denpa Kyoushi.
Both of the teachers in GTO and Denpa Kyoushi resort to... creative teaching methods and do their best to help their students out in ways that defy normality. It's all in good, comedic fun and the teachers have good hearts and the best of intentions for their pupils.
They're basically the same plot. Guy with seemingly no future finds a passion with guiding students to their future, except swap out the badass yankee Onizuka, with the badass NEET Kagami.
Kintaro Oe is a twenty-five year old student of, well, everything. After mastering every course at Tokyo University, he drops out to continue his journey of endless study. Driven by the sole desire to study everything he finds himself doing jobs ranging from being a cook, a swimming coach, a computer programmer, a cross-dressing pop idol, a rockstar, and even being a slave! The only thing that comes close to his love of studying is his love of women. More often than not, he finds himself in "sexually educational" situations, much to his delight!
I think the series are similar because in both series you have someone who want to do what he wants to do and while this person does what he wants to do he opens peoples eyes and they see what they want to do.
Golden Boy has more ecchi stuff and Denpa Kyoushi has otaku stuff and the art is 'better'
Dating sim master Keima Katsuragi wants nothing more than to immerse himself in the 2D world, chasing digital girlfriends. But when the so-called 'Capturing God' answers a mysterious email from an unknown sender, Keima finds himself chasing down real-life ladies in an attempt to help the peppy demon Elsie de Lute Irma capture 'lost souls' escaped from the depths of hell. Now, lest the explosive collar around his neck detonate, Keima must convince various girls to fall in love with him in order to scare out the souls hiding in their hearts.
Otakus helping out girls that attend their respective schools with their problems, be it truancy, personal, conflicts with school regulations or in TWGOK's case, inner demons and stuff. That are personal problems. They have the same brand of comedy and the romance in TWGOK is more prominent than Denpa Kyoushi but they share the same wave length and the other is recommended for readers of either one.
Medaka Kurokami is the perfect honour student. She has exemplary grades, talent at any sport she tries her hand at, comes from a rich family, is exceptionally popular, and has just become the first ever freshman student to be elected School President! During her inauguration speech she proclaims that she will endeavour to help every student with any problem if they simply submit it to the newly instated suggestion box. But with a bare-bones student council consisting of only herself and her unwilling accomplice Zenkichi, people are unsure whether to take her seriously or not. Regardless, Medaka takes each suggestion and gives her all to fulfil any request, be it ridding the kendo hall of delinquents, writing a love letter, or helping a struggling art student find his muse.