 If you liked
GTO
|
 ...then you might like
Iryuu: Team Medical Dragon
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Both mangas have a main character that is, shall we say, eccentric, bold, and impulsive. The main character has to fight against a corrupt sort of system and the people the people that are trying to "protect it". Both main characters have a sort of essence to them that saves the people around them from being "sucked" into the system.