Is it so hard to understand Naruto has a massive chakra capacity? It has nothing to do with the demon fox its all Naruto. He made 200+ clones when yamato was surpresing the kyubi chakra during his training. He enveloped him self in chakra (blue) when he was fighting gaara and made at least 100 clones. Rasengan uses up loads of chakra but he can do it multiple times. Also Kisame does not have limitless chakra and its never said he has more than Naruto which he dont if you include the kyubi. Regardless I hate when people dismiss things done by Naruto because he used the demon fox chakra, its part of him and his character no different from sasuke and his sharingan.