Maybe, but if he was planning on making a character out of it he wouldn't be displaying it as some savage beastNo, but maybe for a girl who lives in our world it MAY look like so.
yeah could've been a squirrel or a guinea pig or a chinchillaThere was no need to make a joke like that. It could have been any other character that appeared or anything else, I mean, there are lots of animal species. Why a mouse? it's ZUN, he wouldn't take it so lightly as to put any random animal.
Anyway...
I found yet another "hint". (this time in GFC)
I have no idea what the connection is. I guess it's something like spirit photographies of dead people.
Okay, before anyone says anything, this MIGHT be the inspiration of Hatate's special way of photographing.