Clarifications.
Naruto meets someone named ''Rick Prime'' and asks him to help him become stronger and become hokage, Rick Prime agrees to help Naruto and takes him on a journey through the multiverse.
What will happen with this new Duo?...
Events before the Chunin Exams.
Harem?: I'm not sure but can you give me some options for the harem.
The multiverse will be both inside and outside the infinite central curve, that is, it is a multiverse that includes both Rick and Morty, Naruto, DXD, etc, etc.
Naruto is 11 years old when he meets Rick.