A delayed update for you folks, but here are the latest KitKats of my challenge.
Almond: Tastier than I expected! Rather than putting almond paste or flavouring in the wafer part of the KitKat, there were ground up pieces of almond in the chocolate coating itself. Nom. (Picture at the bottom)
Strawberry: These were ‘biglittle’ (packet wording, not mine) balls of KitKat with milk chocolate on the outside. The strawberry part was in between the pieces of wafer, making it a truly delicious, if sweet, little snack. (Picture at the bottom)

Strawberry cake: Pink strawberry flavoured chocolate on the outside and slightly biscuity flavoured wafer on the inside. Not as nice as the simple strawberry ones, but nice all the same.

Soy sauce: Contrary to what you might expect, this one worked really well! The malty soy sauce flavour in the wafer was complimented by the sweet white chocolate on the outside. I would absolutely buy these again (except I got them in Tokyo, which is a two and a half hour bullet train ride away.)

Mikkan: (Japanese orange) Also bought in Tokyo, these were like Jaffa Cakes but with wafer instead of jelly. Sooo good.

Sweet potato / Yam: An oddity, this one. The outside is rather sweet, and once it’s in your mouth it simply tastes like a sweet KitKat. However, if you break it in half to share it (as I did) before you eat it, the wafer smells really really strongly of.. potato. A little disconcerting.
Here, as an added treat, is a photo of the wrapper of many KitKats so far. This is not an exhaustive list.
Top - Soy sauce / Strawberry cake
Middle - Almond / Roasted green tea / Kobe tea / Cheese
Bottom - Mikkan / Strawberry / Sweet potato
Plus an additional one for the challenge, a KitKat from home (thank you Kate!)

Almond: Tastier than I expected! Rather than putting almond paste or flavouring in the wafer part of the KitKat, there were ground up pieces of almond in the chocolate coating itself. Nom. (Picture at the bottom)
Strawberry: These were ‘biglittle’ (packet wording, not mine) balls of KitKat with milk chocolate on the outside. The strawberry part was in between the pieces of wafer, making it a truly delicious, if sweet, little snack. (Picture at the bottom)
Strawberry cake: Pink strawberry flavoured chocolate on the outside and slightly biscuity flavoured wafer on the inside. Not as nice as the simple strawberry ones, but nice all the same.
Soy sauce: Contrary to what you might expect, this one worked really well! The malty soy sauce flavour in the wafer was complimented by the sweet white chocolate on the outside. I would absolutely buy these again (except I got them in Tokyo, which is a two and a half hour bullet train ride away.)
Mikkan: (Japanese orange) Also bought in Tokyo, these were like Jaffa Cakes but with wafer instead of jelly. Sooo good.
Sweet potato / Yam: An oddity, this one. The outside is rather sweet, and once it’s in your mouth it simply tastes like a sweet KitKat. However, if you break it in half to share it (as I did) before you eat it, the wafer smells really really strongly of.. potato. A little disconcerting.
Here, as an added treat, is a photo of the wrapper of many KitKats so far. This is not an exhaustive list.
Middle - Almond / Roasted green tea / Kobe tea / Cheese
Bottom - Mikkan / Strawberry / Sweet potato
Plus an additional one for the challenge, a KitKat from home (thank you Kate!)