Kakashi is a very powerful character from the Naruto series, and also one of the crucial ones when it comes to driving the plot forward. Over the years, fans have come to love Kakashi, not just for his role, but also for the incredible strength that he has displayed time and again throughout Naruto. Kakashi has always been famed as a genius, and the vast majority of his strength, at least throughout most of Naruto, came through his Sharingan. Kakashi has always been extremely reliant on Dojutsu, and it would certainly have been incredibly fun for fans to see him with an even stronger power, such as the Rinnegan.