Natto - Natto is a traditional Japanese food made from soybeans fermented with Bacillus subtilis. This food is very common for Japanese meal time, since it is really good for health. However, it kind of has a unique smell. Because of that, some people do not like it.
Really Rainbow Sushi. I see tuna, sake, possibly tamago for the yellow, but could also be mango (ooh, that would be good!). I couldn't figure out the purple, maybe taro? And the last one could be some kind of fish or red onion. Please comment if you know.