Shichimi Togarashi (seven flavor chili pepper) is a staple in my kitchen. It's a spicy seasoning that is typically made from seven ingredients, one of them being red pepper flakes. It's delicious on udon and ramen, and I sometimes use it on curry or donburi.
Ichimi Togarashi (one flavor chili pepper) is also available, but it's just red pepper. Shichimi has more of a distinctly Japanese flavor with the added nori and sesame seeds, but those flavors might muddle up a KitKat, so Ichimi was probably a better choice for a flavoring.
I could smell the pepper right away. The chocolate was a bit bloomed from its journey (since it was shipped at a time when it was still fairly warm in that part of Japan but cold where I live), and it looked like dark chocolate.
The red pepper had a nice, slow-building heat that was noticeable but not too strong. Dark chocolate was definitely a good choice for this flavor; the slight bitterness went well with the pepper flavor. I wish I had ordered more than just one mini bar!