When it comes to women without mouths, we have to say that there are three girls without mouths, and three girls without mouths, hearts and expressions. And her ancestor, the first girl with three noes, was Eva's Ling Boli, whose hair was blue or blue-green, and Ling Boli also became the representative of girls with three noes, so all his later girls with three noes had the same place with her. In addition, blue and turquoise are cool colors, and Sanwu is also cool colors. Moreover, when it comes to cold, you will think of ice. In the animation, the ice water is sometimes depicted as blue, and the girl in the Three Martial Arts is sometimes called an iceberg beauty, so the hair, pupils and clothes are more or less blue. The mushroom head you mentioned is also inherited from Ling Boli, but not all women without mouths and girls in the Three Martial Arts are what you said. Hoshino Ruri, the head of the second generation of "Three Girls", the mobile battleship, Esther's Elf Sword Dance, Ania's CodeGeass Rebellious Land R2, Edgar's Pandora's Love for Summer, Tianxiang Girl, and Elda's PC Angel's Heart are none of them.