TJ seemed to have more confidence in himself then he did in the first and second season it was like a transformation on the kid in the first two seasons he had trouble making friends at his new school mo and marcus did not want to hang around him he was more of an outcast to society i no thats the point of the show a 10 year old boy finding his place in the world, then by the 3rd season he comes back a changed person marcus and mo wants to hang around him he is playing pranks on people, he starts drinking beer, he is a rebel i like the new TJ in the last season he is more mature.