Kokonoi Hajime is described as the fussy and playful type who loves to be center of attention. Inui Seishu, on the other hand, is the calm and curious type who seems to always be observing and thinking about things. The two used to be humans in their dimension, Kokonoi as the guard captain in the Black Dragons and Inui as the Black Dragons' blitz captain. Their sudden reincarnation as pets in a different dimension surprised them but it seems they're adjusting well to their new lives.