- Kai appears in the artwork for and is quoted in the description of . He also appears in the artwork for .
- Kai is one of three original characters (along with 100% Orange Juice!. and ) who debuted in the original release of
- Kai's theme was composed by DEKU. This makes Kai the only character without a royalty-free theme.
- Kai had a different theme in the Beta version of 100% Orange Juice! which was royalty-free. The original theme was "Fair Wind" from TAM Music Factory, which can be heard here.
- Confirmed by DEKU in Twitter messages.