So... is Great Teacher Onizuka finished or not?
NO, it is not finished.
Why?
We found unfinished non-core content:
Ino-Head Gargoyle (Spin-Off)
GTU: Ikari no Death Yamada (Spin-Off)
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Shonan Junai Gumi!
Young GTO
Anime - Prequel
Release date: January 21, 1994
Great Teacher Onizuka
グレート・ティーチャー・オニヅカ
Anime - Base
Release date: June 30, 1999
Synopsis
Eikichi Onizuka, a former biker gang leader with less-than-noble intentions, decides to become a high school teacher in hopes of attracting a young wife later in life.
He lands a job at Holy Forest Academy, assigned to the notorious Class 3-4, a group known for driving their teachers to quit through relentless psychological torment.
Onizuka, despite his unconventional methods and questionable morals, is determined to break through to these students and address the serious issues they face, using his unique brand of chaos and surprisingly effective wisdom.
The anime focuses on Onizuka's journey to connect with his students and help them overcome their problems, proving that even the most unlikely individual can become a great teacher.