I loved this manga it was funny, dramatic and had great artwork. Not to mention some of the best writing that can be humorous, dramatic and/or meaningful because this does cover issues in Japanese society and covers a lot of themes: Broken homes, school bullying, abuse of power, corruption and so forth.
I loved Onizuka he was a great character who uses his past to help people and despite the comedy he is still very human which was what I liked. In fact almost all of the characters have humanity in them no matter what kind of character they are or start with.
Also Onizuka got to have great chemistry with at least 5-6 female characters. Also I liked the relationships between Noboru and Anko and also Kikuchi and Ai. Also it was a good move for Fujisawa to leave GTO open ended.
Onizuka and Azusa it felt more like Onizuka feelings to her were platonic and/or brotherly but there was great chemistry between Onizuka and Urumi and Onizuka's relationships with everyone including her was quite well developed
Miyabi Aizawa was also an interesting nemesis for Onizuka at first I hated her but grew to like her as time passed when I learned what made her the way she was and how a plan to get back at someone who hurt and humiliated her got out of hand and set in motion the events of the manga
Also Misuzu Daimon in the final arc of the manga was a very interesting antagonist despite her questionable methods and attitudes she is also human as we learn in the manga.
There is nothing short of the best character development I saw and I liked how everyone had a reason for being the way they are but also Onizuka coming in to help out.
This is a classic manga and please don't bother with the lame and boring 1998 GTO Live Action which I really hated but the 2012 live action remake was a pointless, cliche, shallow, badly told and utterly pointless load of tripe I mean seriously in the 2012 there was almost almost no character development, no chemistry and flat acting so take my advice and give both live actions a miss. Event he anime while incomplete told a far better story then either Live Action.