It is to be noted that Miu has a very crude sense of humour and uses it in a very exaggerated way! 

Voice - High to mid pitched

Voice Type - Cooky, crazy, 'Miu Iruma'-esque.

English VA - Wendee Lee

Personality-

Miu is described as an oddball, having an overly confident, loud personality and a frighteningly sharp tongue. She considers herself a beautiful genius, and every time she opens her mouth she spews a parade of reckless vulgar remarks and insults, strongly putting pressure on others and looking down on them.  She also tends to give other characters insulting nicknames.

However, Miu's arrogant personality seems to be only a mask which can drop fairly easily. This often happens when her festival of coarse language and dirty jokes actually get replied or ignored. Then, her personality quickly changes into a timid weakling, who is terrified of other people being angry with her. Because of this, she has the charm similar to an innocent child.