>>2797402
>Onaholes. The really good ones are hard to find, at least in Europe. I really need to find one of Ranka next time.
>Beer. Japanese beer tastes very good and the one sold oversee is usually also produced there (without rice).. so tastes different.
>Instant ramen. Those seasonal/limited ones you can find in some konbinis. Some taste really good.
>Magazines/Artbooks
>Japanese used CDs (jpop, 80s, ..)
But overall you can already get lots of things outside of Japan. I sometimes order from amazon.co.jp. I would focus more on souvenirs that you value. Things that you find in 10 years in your drawer and directly activate some memories