Ōkamiden/WMG

Manpuku is Kuni's ancestor
Only those of the proper lineage can touch the fruit of a Guardian Sapling, right? Kuni did it in the first fight against Master Anura, and Manpuku did it in the Boss Rush. Makes sense, no?
 * I thought it was only those of the proper lineage could defeat Anura, not touch the fruit.

Michigami and Kyokugami are Gods of the Moon Tribe
In both the Japanese and English virsuons the Moon Tribe speaks a western language (English I'n Japanese and French I'n English). Therefore Michigami and Kyokugami are perhaps the gods of the Western Zodiac. Kyokugami is Peices and Machigami could be Libra (representing balance and judgement). Both gods are found where there is a probable connection to the Moon Tribe (Kyokugami definately so and the River to the Heavens has that mystical gate which screams Moon Tribe style Magitec.)

Chibi didn't fix the broken mirror from Hana Valley -- Ammy did.
It seems reasonable enough for Amaterasu to be a keeping an eye on her son while he travels Nippon, and Chibi seems just as surprised as Kuni when the mirror is fixed -- and when prompted to fix the mirror, we are never given any indication that Chibi himself is doing it.

Kuni
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 * Lets look at the facts, shall we?

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Akuro is an Expy of Dark Matter.
A while after beating Okamiden, I realized that these two have a fair bit in common. For one, they look similar. Both are black Eldritch Abominations with a single eye and appear to be made out of black smoke. Both desire to spread darkness across their respective universes. Finally, both make use of possession to accomplish their goals. Granted, Okamiden is much more plot-driven than Kirby is, so Akuro's a bit more well developed, but I found the similarities between these two to be very striking. If it's coincidence, it's one heck of an example.
 * Not only that, but both Kirby and Chibiterasu are adorable heroes that end up fighting them at the end.

The black smoke that came out of Orochi, etc. in the first game was Akuro
If Amaterasu ended up killing them, then the part of Akuro that controlled them could be concentrated into Akuro's ultimate body of darkness, Yami, making Yami even more powerful just in case he had to square off against Ammy.

The baby that Kushi is pregnant with at the end is Kuni
And several years after the baby was born he strayed into a Spirit Gate to the Moon Cave.
 * Jossed. In the stinger of Okami and the Art Gallery of Okamiden one can see Susano and Kushi with a son that looks very different from Kuni, resembling Susano even more than Kuni. This is likely the child Kushi is pregnnt with at the end of Okamiden.

The reason for Manpaku's hunger is...
Because of his hair. No, seriously. It's literal fire. And to generate it, he needs energy to burn, of course. He's LITERALLY burning calories all the time, so he constantly needs to eat. He also doesn't know how to control it so he's always hungry! No idea why he's still so tubby though.