From a the day after the kyubi's attack naruto is taken by Hiruzen to live in the anbu hq and at a young age naruto starts copying the anbu he is regularly in contact with going as far as wearing his mother's mask (Kushina became anbu commander) then went onto join the anbu quickly making his way up the ranks to anbu commander instilling loyalty and fear into his men

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Guardian of the rookie 9
FanficOriginal author: may wren, I got the inspiration when I read ibiki's apprentice Read the summary