There are some very Massive, multistory figure shops in the center of Akiharaba. It’s very hard to miss some of these shops because they are massive and just right outside the train station.
There is a very good chance that you will find your favorite anime Character.
Some shops, you can literally go through 5 or more stories of displays like this! I had to make multiple runs though the stores just to find a few characters I was looking for.