HI I'm Sam and I think a few of mine will be interested in meeting Kubo. I've got Sam Alexander from Marvel, who's close in age. Donatello from TMNT, also close in age, and while it's not his weapon specialty, he could probably teach some sword tricks because ninja and all.

And Ina here from Samurai Warriors is s samurai wife who will probably be incredibly relieved to meet someone operating on relatively the same page culturally! (Is it at all hinted in Kubo's movie where it'd be placed historically? Ina's from around 1600.)

Also I have Hal Jordan from DC who I can't think of any obvious CR opportunities with but this is the land of the unexpected, who knows what will happen.