Along with the theme of you never know what you'll find in Japan....
Japan has this subculture of small toys you get out of gumball machines. Lots of people collect them and they have thousands of kinds.
Here's the some of the Simpsons
There's the Thunderbids! Thunderbirds are GO!
What the heck? There's robot Mickey and Minnie Mouse
In Akihabara there are a couple of stores that are just a room full of these machines and their are other stores that sell all of the toys already out of the machines so you can pick and choose but of course they double the price.
So I'm walking around some random place that has just 12 or so machines and I find these toys mixed in with all the other stuff.
Apparently these are based on characters from Vampire Hunter / Night Warriors
And these are based on some adult anime / manga I think.
If you are interested, Yujin seems to be the biggest brand. Their site is hard to navigate but you can find most of their toys from this page. Pick an entry from one of the drop down lists and then follow the links.