6. Kakashi Hatake
Before becoming the team leader of Team 7, Kakashi Hatake was also a part of ANBU. At ANBU, Kakashi was the team leader of team Rō. Kakashi has copied over 1000 jutsu and was feared because of the use of the lightning blade. Kakashi completed many assassination missions as an ANBU, and was later relieved of his duties by Hiruzen Sarutobi.
5. Konohamaru’s Father
Konohamaru Sarutobi is the grandson of Third Hokage, Hiruzen Sarutobi. His father was the son of Hiruzen Sarutobi, and was a member of ANBU black ops of Konohagakure. Since, all Sarutobi clan members are very powerful, there is no doubt he would have been as well. Also, little to nothing is known about him, but he is said to have quite some reputation among the ANBU.
4. Konohamaru’s Mother
Like Konohamaru Sarutobi’s father, his mother was also an ANBU black ops, and a member of Konohagakure. She would have been powerful as well, as she’s a part of Sarutobi Clan. Nothing much is known about her as well.