I think this ^ is too complicated. The Naruto system has just the right number of ranks, in my opinion:
1) Academy student.
2) E-Rank => usually genin
3) D-Rank => usually chuunin
4) C-Rank => usually tokubetsu jonin/ special jonin
5) B-Rank => usually jonin
6) A-Rank => usually ANBU material
7) S-Rank => usually kage
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