Calvin is the sage of 6 paths...

[swaminaruto]

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As you can see very well in the second panel, he has the rinnegan.
I think Kishimoto's planning for a big reveal...think about it...Calvin also exists in a manga-like format...He has been present long before Naruto started and he imparts wisdom to the world...And of course, Hobbes is the Juubi which manifested itself as a tiger after he became its jinchuuriki...
Well done, kishi, very well done!!!

 

[Mitarashi]

I don't know why you even posted this..

 

[Anonn]

I don't even know why you thought about this...

 

[Οdin]

I agree.

 

[kunde]

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....

 

[The Sach]

All Hail, lord Calvin!!XD

 

[grizzlyshree]

who is calvin?

 

[swaminaruto]

who is calvin?

He's an insanely popular comic strip character...Google 'Calvin and Hobbes' and see...

 

[swagking]

this made me laugh good job