Board Thread:Naruto Discussions/@comment-28939725-20161116235549/@comment-1512913-20161118200845

Um, before Kishi switched to the anime's blue Rasengan, most likely for the anime fan appeal, it was drawn as yellow for Naruto. And on the cover with Hagoromo, Naruto and Sasuke, those things behind them are obviously meant to represent Asura and Indra and guess what colors they are.