Board Thread:Theories and Speculation/@comment-26417995-20150530112831/@comment-1926479-20150629175739

Legendary Super Saiya-Jin 4 wrote: Konohamaru is Boruto, Sarada, and Mitsuki's sensei, so he wont be the one teaching them. Mirai is only a Chunin, and is only a few years older than them, she is way too young to be their leader, she isn't even a Jonin yet. Their sensei will likely be a brand new Sarutobi Clan member we never met before. It's not out of the realm of possibility since she apparently is qualified enough to escort Naruto during the Epilogue, but there may be a minimum age though.