Google translate didn't help me very much in my efforts to figure out who these vinyl toys were. It did indicate that this little fellow was called "Plum Superman":
Update: Jake informed me the characters are from a show called Dr. Slump. I believe the character is called "Suppaman" and you can see another Suppaman toy at Flickr. And Shoma explains that his name is a play on "suppai", which means "sour" in Japanese. Thank you both for the explanation.
*Previously: Gallery of fruit labels.
*Buy Dr. Slump toys at eBay.