Kakashi: "He's a pervert"
Naruto: "My goal is to surpass him"
Orochimaru: "The best experimental subject"
Kai: "He is my teacher and my goal to surpass"
Cassius: "My teacher, the founder of martial arts" (Kiseki in the Sky)
Estelle: "He's a weirdo!"
This is a weird story that travels through anime and games. As for the weird way, you can only understand it by reading this novel.