why did konohamaru have to pretend to be naruto on the day naruto became hokage
Konohamaru is the grandson of the Third Hokage, Hiruzen Sarutobi, and he looks up to Naruto as his role model. On the day Naruto became Hokage, Konohamaru wanted to show his support and pay homage to Naruto's achievements.
Konohamaru had a strong desire to make Naruto proud and honor his friend's accomplishment. He decided to disguise himself as Naruto in order to pay tribute and surprise him during the inauguration. It was his way of expressing his admiration and loyalty towards Naruto, showcasing his determination to follow in Naruto's footsteps and become a great ninja himself.