Konohamaru Sarutobi is the grandson of the Third Hokage, Hiruzen Sarutobi. He is a jounin level shinobi and the leader of Team Konohamaru. He taught Boruto Uzumaki the rasengan which he learned from his mentor Naruto Uzumaki.
Konohamaru was born into the Sarutobi clan and was named after Konoha by his grandfather. While being raised by his Anbu parents, Konohamaru was never referred to by his name by the villagers, only ever called “Honourable Grandson” (お孫様, Omago-sama) because of his relationship to the Hokage. Wanting to be acknowledged as a person and not simply the Hokage’s grandson, Konohamaru began trying to defeat Hiruzen in order to replace him as Hokage.