Ninja ranks in Naruto are divided into genin, chunin and then jonin.
However, there are still five powerful ninjas in Naruto who never became chunin.
1. Uzumaki Naruto
The first time Naruto Uzumaki took the Chunin Exams, he failed.
But Naruto was never a chunin.
So did Naruto pass the test or not?
2. Uchiha Sasuke

Sasuke is another case, he is the most potential genin in Konoha.
3. Karin

Karin was a genin who took the Chunin exams, but she did not pass the exam.
4. Might Duy

Unlike Kosuke Maruboshi, Duy is a full-fledged character presented by Masashi Kishimoto, not just a supporting character.
5. Kosuke Maruboshi

Although only a supporting character, Kosuke is also notable.
One of Kosuke’s notable traits is his mastery of ninjutsu, as he was taught by Tobirama.