One of the biggest complaints from fans about Boruto has been the absence of characters from the original Naruto series. However, it seems creator Mikio Ikemoto is planning to change that. Recently, he teased the return of a legendary ninja who has been missing from the manga for a long time: Sixth Hokage Kakashi Hatake.
Kakashi Hatake Is Coming Back to Boruto

In a recent interview, Ikemoto was asked if he wanted to design any classic Naruto characters for the new series. He replied mysteriously: “I will reveal the story soon. But you have to ask yourself, ‘Why hasn’t Kakashi-sensei appeared much despite being such a famous character? It’s a mystery. I can’t reveal anything about that.”
This answer suggests Ikemoto has a major role planned for Kakashi, and the storyline has been in development for some time. Fans are eagerly awaiting Kakashi’s return, especially since Uzumaki Naruto has been sealed away and cannot appear.
Could Kakashi’s Return Revive Boruto?

Although Kakashi may not seem connected to the current plot, he is set to play an important role in the future. Ikemoto himself revealed this, emphasizing that Kakashi’s appearance is necessary to make the story more engaging. While Boruto has been captivating, the series needs a boost, especially as manga sales show signs of decline.
Bringing back a beloved fan-favorite like Hatake Kakashi could work wonders for the story. This is a crucial moment since both Uzumaki Naruto and Uchiha Sasuke are absent, making Kakashi the key returning character to capture the attention of longtime fans.
Source: Gamerant