Some of the recent KitKat that were sold during summer and autumn.
The above may seem quite normal since green tea is such a popular ingredient in a lot of Japanese sweets and desserts. This is coated in macha powder, so it may taste slightly bitter for some. Hence, it's in the オトナの甘さ collection. Translated directly it means adult sweetness.
The bottom is the Halloween edition featuring pumpkin flavoured confectionary and coated with dark chocolate. Didn't get to taste this myself coz I gave them all away :p
This wasn't in any special wrapping but looking at the packaging, it seems like some sport-related KitKat.
First saw this during my first few weeks here. It's the vanilla ice flavoured KitKat! Best eaten when frozen apparently. Coated with vanilla flavoured chocolate, this can get quite sweet, but otherwise it's like a normal KitKat.
This is also from the オトナの甘さ collection. The packaging says it's white chocolate flavoured, and features the famous Hokkaido milk. If you notice closely, the inner chocolate has dark chocolate stripes in between. Seems like オトナの甘さ means the KitKat does not taste as sweet as ordinary KitKats!