Board Thread:Theories and Speculation/@comment-33113955-20170916062948/@comment-33156423-20170925211728

But Naruto has been like a big brother to him always, and so has the other friends of Naruto, but Kurotsuchi is not even from Konoha

Thekillman wrote: Konohamaru Sarutobi calls Naruto Uzumaki "big brother". I think that says enough.