Kurama is one of the main characters in the Naruto series and certainly a powerhouse. Although introduced to fans as an antagonistic character, Kurama went on to help Naruto greatly later down the line. At first, Kurama was opportunistic, looking for ways to harm Naruto so that he could eventually break free. Eventually, however, after witnessing Naruto's painful journey, had a change of heart and these two formed a very strong bond. In many ways, Kurama is the closest bond that Naruto has ever had, but, unfortunately, in the Boruto series, this bond was effectively shattered. Now, Kurama has been reborn inside of Naruto's daughter, Himawari, and fans know that he is going to be extremely powerful with her as well.