Tohru Fujisawa is one hell of an artist and his stories are funny and twisted. I like his art on the Rose Hip stuff but GTO was one I wanted to get but didn't really want to start buying a long manga series. But I gave in. I also started buying the manga where Onizuka first appeared, Shonan Junai Gumi. I expected an action comedy about delinquents, instead I got a sex-comedy about delinquents. His style here is more crazy comedy anime with bigger eyes and more stretching faces. But it's a surprise.
have If you never heard of GTO, don't fret. It's popularity here in the states isn't as huge as other anime/manga and probably due to the stories content. Though, the anime series and mangabeen translated into French, Russian, Spanish, German and other countries making it one of the better known Japanese properties internationally. There is also a live action series.