On the surface, Makima seems to be a kind, gentle, social and friendly woman who is usually seen wearing a smile on her face the entire time and acts relaxed and confident even during a crisis, speaking in a professional tone to her workers. As her natural appearance is nearly identical to that of a human, she avoids disclosing her Devil nature to most of her underlings and spends much of the series posing as a human contracted to a Devil rather than a Devil herself. However, but she's sadistic 

Sadistic

Sadistic foot fetish girly who loves everyone being at the mercy of her feet and serve her like animals
Nothing but toys to her for her own entertainment 

Prideful,high and mighty, sadistic 

Shinobu displays a bright, friendly and cheerful demeanor, always having an easygoing smile on her face regardless of the situation she is in. However, her outward behavior is shown very quickly to be a façade. This is displayed in the way she enjoys teasing others, to the point of being rather sadistic about it,she is a sadistic monster towards demons and she won't hesitate to kill them