"In Japan, the color red is associated closely with a few deities in Shinto and Buddhist traditions, and statues of these deities are often decked in red clothing or painted red. There are many clues that underpin the red association. The most compelling clues involve demon quelling and disease (e.g., smallpox, scarlet fever, tuberculosis, measles).
According to Japanese folk belief, RED is the color for "expelling demons and illness"............."
http://www.onmarkproductions.com/html/color-red.htmlIn the Shinto religion, white symbolizes purity, so it would make sense Ammy and the others you listed were white and red.
I'm not sure on the markings though, I haven't really looked into it.
The markings could just be traditional folk design.
edit:
Now that I think about it, the ? looking designs on the CS pet and the fire looking thing (lol) by it do more than likely symbolize something. I've seen them before on tons of other games, japanese folk and traditional art, and even animes on Adult Swim.
edit:
All I can seem to find on 'swirls' is the magatama, which were 'beads' used in pray, offerings, and royalty.
The ones by the CS pets, and of other demons in Ookami and folk art... I'm not sure. They may be some kind of religious seal or symbol meaning ghost, demon or such.
I'm not sure. I've been wanting to know for a while now if they mean anything.
I'm probably sounding like an idiot, but oh well, I hope I helped a little.
But yes, you're right about the Shinto. XD
An has for why wolves, i believe I read somewhere, in Japan, wolves symbolize 'hero/heroism'.
Has for examples, I know in the horror/survival PS2 game Kuon you can summon a white paper wolf.