Kozara
When I went back to Japan, I bought small dishes, because it's hard to find similar sized dishes in the UK, especially in my area. There are many small portion dishes in Japan, which are called 'Kozara (a small dish)' or 'Kobachi (a small bowl)'. There are a lot of choices. When it comes to buy some, you will feel like a kid in a candy store. It's a good size to put soy souce (or other dipping sources), pickles or small portion of something in them.