i was talking to my good pal @ragtiming about a shepherd au where everyone takes care of their own herd of animals, and i thought yamamura would like to have a koi pond. cuz, you know, the impurity drove him mad, and koi are calm and beautiful. unlike vermin. and you can drop certain vermin IN the ponds and the koi will eat them. he loves them very dearly and probably names them secretly. get him to talk about them enough and he might tell you their names.