NRG is a good choice...
I bet Upchuck could eat the Rasengan or Rasen Shuriken, yet he would be beated down in close combat
Chromastone, if we count the Chackra as energy, could absorb even the nine tails chakra (he managed to absorb mana, so maybe he can absorb Chackra) or the Sage Chackra that powers the Sage Kata
Way Big for the reasons already named (It would be different if Way Big had an ultimate form, that would be awesome)
Rath could be a problem to base Naruto, yet Sage or Kyubi would pummel Rath to death (I would pay to hear "Let me tell you something Naruto Uzumaki! Rath is tired or your glowing balls!")