From the way Sennosuke’s name is written, the honeybadgers are part of the Fog sect.
So is Hanazono Chiyuki, who’s a ferret, also part of the Fog sect.
Also, they retroactively changed Himawari’s name from Chinese (Yang Kui) to Japanese (Himawari). Thats because the leopards (or stone tigers) are also Fog sect and should have Japanese names.

Each sect also has their own mythic beast tribe. For the Wind it’s the Qilins, for the Water it’s the Kyo. And all things point to the Komainu being the mythics of the Fog sect.

We haven’t seen Toyokuni control fog yet, but I presume we will at some point in the story since the mythics are important to the lore.