Japanese kit kats comes in all flavors and sometimes the flavors is region affiliated like Wasabi flavor is associated with Shizuoka prefecture, sweet potato flavor is associated with Okinawa. You can check out this link for some of the region limited flavors. Flavored kit kats are so popular in Japan that they have a few pop out stores around Japan that sells out or is thronged with tourists trying to get their hands on some limited flavored.
Here are some of the flavors that I had tried to date
Strawberry cheese cake and almond jelly flavor. I prefer the almond jelly one though.
Orange lime flavor from Shikoku prefecture.
Niigata Pear flavor.
Blueberry cheese cake from Jou Koushinetsu
The new baked kit kat that came out last fall in Japan. Sold in supermarkets.
Pocky comes in all forms too.
Giant rainbow ones
Creamy chocolates ones sold during winter.
Heart shaped ones for Valentines!
Here’s the koala snacks that you toast it before you pop it in your mouth, sold during the winters