Kaguya Otsutsuki is one of Masachi Kishimoto's most powerful, if not powerful characters. Kaguya came to Earth a thousand years ago from the mysterious Otutsuki clan and became totally dominated by the inhabitants. With its drive to power, it was consolidated and dangerous, with Hagoromo and Hamura Otsutsuki finally taking control of its sons.
In the 4th Great Ninja War the return of Kaguya Otsutsuki was considered a terrible enemy. Few have been able to achieve the same authority over the years and few have managed to overcome it. Five persons in Naruto and five others who couldn't register Kaguya Otsutsuki can.
Naruto the protagonist of the show
The main character of the Naruto series is one of the strongest shinobi of all time, Naruto Uzumaki. In its link with the Thai Beast, Naruto obtained enormous power in the fourth Great Ninja War.
The Sage of Six Ways also enabled him to practice Yang's talents on the Six Way to make him incredibly strong. He fought and kept Otsutsuki's seal and finally played a decisive role. After the conflict, Naruto became stronger, therefore he could have been more powerful than Kaguya Otsutsuki.