Peter is portrayed as a young playful boy through the use of simple rhythm (4/4) and bouncy rhythm (swung, tied, pizzicato, arco, tenuto, staccatos and high short accents in the first part).
The volume creates interest and the sense of predictability through the use of a quiet beginning (p) increasing (crescendo) to a medium volume (mf) quieting (diminuendo) back to a soft sound. The effect of volume adds the amount of interest Peter has in any one thing at one time, listening to the bird and distracted by the duck, bird noise fades.
The texture of this theme is homophonic which differentiates it form the other characters' themes, for example the bird. The composer is showing Peter is more complex through the use of homophonic texture (more instruments) than the bird with monophony (1 instrument). More attention is given to Peter, therefore making it more obvious it is a leading role.