Mugman is a bit more on the cautious side compared to his older brother but not afraid to join into any trouble which may be caused by the sibling. Though he is more passive and calm in nature he's willing to get his brother out of most of the trouble he gets himself into. Often he has to be the voice of reason out of the siblings and will every so often have to - terrifyingly - remind him that neither of them will leave the other behind no matter what. He often feels like out of the two he should have been the older of the litter since his brother does a really bad job at being a diligent big brother and often leaves him to have to clean up the messes.