1. Design reason: When the designer first designed HelloKitty, he hoped to create an animal image that was deeply loved by children. The design without a mouth makes HelloKitty look more lovely, and at the same time, it also leaves room for people to freely exert their imagination, making the image of this kitten more unique and charming.

2, aesthetic considerations: HelloKitty's face is usually occupied by eyes and nose, if you add a mouth, it may affect the overall aesthetics.

Symbolic meaning: HelloKitty without mouth represents a feature of Japanese culture, that is, "say less and do more". This design also shows that the HelloKitty brand wants to silently support and help customers, and does not need customers to take the initiative to speak.

4. Emotional expression: Because HelloKitty has no mouth, it can't show the specific expression of emotions, thus inspiring people to imagine and create HelloKitty's expression according to their own emotions, so that it can accompany people to experience different emotional states.