Harry is an outcast of the group. He isn't very popular at school, but proves himself a good friend to everyone later on. He is very loyal but can start to accuse people without evidence.
In the absence of their teacher, Gerry Simmons, he takes charge of the group. He begins an relationship with Lucy and she finds out he has epilepsy. The last series is when he is enthusiastic to get his friends back but gives up when he thinks it is impossible. We don't know if he survived in the last episode.