Answer:
id
Explanation:
According to my research on Freud's model of the psyche there are three main parts. These three parts are the following.
Ego: realistic part that acts as an intermediary between the id and superego
Super-Ego: is the moral conscience
id: is the primitive and instinctive part that contains sexual and aggressive desires as well as memories.
According to these definitions provided by Freud we can say that Ron was mostly the id in the group. Since he was the primitive and instinctive one always seeking what made him happy.