'Naruto' And 'Bleach' Anime Studio President Rejects Idea That Anime Should Conform To Western Standards: "If You Make Animation...
The President of Naruto' and 'Bleach' production studio Pierrot Co. Ltd Michiyuki Honma believes anime needs to remain effectively Japanese.
The character is a bit of a delinquent, like all of the other tailed beast holders, and the freestyle rapping is one way they expressed that. Similar to how Naruto used to be a vandal.