OURI, the avatar that teaches children to breathe properly

This is what a business in Belgium was looking for in their mascot design

Avatar for a mobile app for young children, aged around 4 to 9, to teach them mouth and tongue exercises

My request is to create an avatar for a mobile app for young children, aged around 4 to 9, to teach them to develop their tongue muscles through various exercises.
The avatar to be created suffers from night-time apnoea, is tired and does poorly at school. He will ask the player to help him do around ten different exercises. The exercises will be shown by drawings. Each time the player completes an exercise, the avatar feels better and receives a reward (yet to be imagined). And the avatar will show its pleasure in an amusing way to reward the player.
The avatar can be human, animal or somewhere in between. Either it is not gendered, it must exist in the 2 classic genres. Read more