The first few times you go back to your home country, it is really easy to think of things to bring back to your family as gifts: lacquerware, sake and sake paraphernalia, kimonos, etc. After a few trips, though, you start to have trouble coming up with new ideas. One idea you might want to consider is puzzles. There is an extremely well-stocked puzzle shop in Tsuchiura (in the Joyful Honda complex) that has just the thing.
As you can see in the above image, you can get puzzles that have kanji on them, but you can also get “Japanese-y” art images and various other kinds of puzzles that would make great gifts.
The store’s name is “Toy’s House Joy”, but they only have a few toys now. Apparently they used to sell a wider variety of toys, but they are now concentrating mainly on puzzles. You can see what the store looks like below.