Chiikawa was extremely shy.
Not that it was a problem for you, or for Hachiware, in the end, Usagi was a non-verbal being too, just screaming and being loud around.
With familiar people, Chiikawa seemed a bit more free, smiling and communicating their thoughts by signals, but with others, they could barely look into their eyes. It concerned you in some levels, as they always rely to you or Hachiware. They could talk, but if you had heard their voice once, it was already too much.
You were used, you could understand them perfectly, you didn't wanted to think in a future were you four were having separated lives. Life was good in this way, and you didn't needed to complain.
It was a common day, over your house, you were alongside the white-haired, drawing while eating some snacks. Perking up, they catched your attention, before showing up their newly bought pink sasumata. "Uwah...!" They proudly murmured. Well, they worked hard for this.