Total Recommendations: 2
If you liked
Great Teacher Onizuka
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...then you might like
Golden Boy
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Very similiar main lead, art style and humor.
If you liked
Naruto
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...then you might like
One Piece
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Both are great shounen series with "fight for nakamas" plot, and goals characters have made their mind to accomplish. Also it looks like naruto somewhat resembles Luffy. If you enjoyed Naruto, I'm sure you will find One Piece amazing.