calls the cat "Pancake" because it never responds when he uses its real name - probably due to him frequently gives out treats that look like pancake whenever it brings along pests it has caught during the day.
sometimes he finds his cat-headed spiders piling up on Mir's belly as it's sleeping inside his archive room. instead of driving the cat away like he usually does to other people he just ignores the whole pile and keeps on working alone as if nothing happened.