Maybe some books, or some handicrafts specially made in your country. When I came to Japan, I brought chopsticks made from woods, originally handmade from my country, and also small leather puppet (wayang), a cultural symbol of Javanese people. In Japan, the temples/shrines sell many lucky charms or so, but (1) make sure you can speak Japan, because (2) every lucky charm has its own purpose, like a special charm to make one give birth easier, lucky charm to safe trip, etc. And not much people in the shrines can speak English, so you may end up buying lucky charms not suitable for your purpose. There are also small beautiful gifts like keychains, but I heard rumors that gifts with price less than 100 yen are made in China. You know, Japan-made souvenirs are well-quality and usually wrapped beautifully.