Use soft shapes and readable faces
Rounded shapes, clear eyes, simple mouths, and gentle gestures help kawaii stickers feel cute while staying readable.
Mix affection and reaction
Hearts, hugs, please, thank you, sleepy, excited, shy, crying, and proud reactions make a cute pack more useful than pure decoration.
Keep the palette gentle but not flat
Soft colors work well, but the sticker still needs contrast. Outlines and small accent colors help the subject stand out.