Morishi (original name is Morishige but they pronounce it so oddly, so I just remove the "ge") is very much an introvert. he keeps to himself and spends most of his time either talking to himself or doing his best to avoid Mayu. eventually Morishi loses sanity so when he turns he is an amped up version of the original crazy morishige. 

his voice has a very slight grime. he sounds young for his age but nothing toddler like. he can tend to snap lightly if people don't listen to him or if Mayu is involved. For preference, think a young Todd Haberkorn