Miu Iruma

"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. In the original Japanese, she even uses the Japanese word "ore-sama" to refer herself, which is considered very arrogant and more traditionally masculine. She also tends to give other characters insulting nicknames, and would routinely call them virgins. However, Miu's arrogant personality seems to be a mask that can drop fairly easily. This often happens when her festival of coarse language and dirty jokes actually get replied to (usually, with the person snapping back) or ignored. Then, her personality quickly changes into a timid coward, who is terrified of other people being angry with her. Because of this, she has a charm similar to an innocent child."

Voice Example

https://youtu.be/0DVW3x73WiE?si=oZnsRyyi-O45fzn-