Jonny is aware as they all are of the cameras watching their every move, and does no more than the others at playing up to them. He is a lovely guy, even if he is a tad too sensitive sometimes. In the beginning he was very excited and bounced around in his bubbly bright. loud and very very funny manner. Certain old farts made it known they didn't appreciate his strong personality, his humour or very much else about him and when he was nominated for eviction he thought to survive he better tone it down. The fact that Alison who was also a bright loud funny chatracter was evicted made him feel that the public didn't want this kind of behaviour either, so he was almost mentally forced to keep a very low profile from then on. Poor Jonny, he looked very withdrawn at this time. This reminded me of how Brian went through a similar situation last year when he was forced to calm right down because certain members of the house didn't like it and told him in no uncertain terms.
Jonny is one of three genuine people in the house, Kate and Sophie being the other two. I do feel Alex is probably being himself too, although not very pleasant sometimes.