JJ has a huge imagination, shown by his enthusiasm for magic. With childlike excitement, he dreams up the entertaining schemes for himself. He is best friends with Freddie and Cook and they're known as the 'Three Musketeers'. He is well spoken and extremely good at math, science and many other academic subjects, but lacks basic social skills. He has high-functioning autism, and has developed a close friendship with Emily Fitch, considering her to be his best female friend. In Series 4, with the desolation of his friendship with Cook and Freddie (as they all fought over Effy in Series 3), he becomes much closer friends with Thomas and eventually reconciles with Freddie. His friendship with Cook, however, is not fully repaired until near the end of Series 4.
JJ's profile on E4's official Skins website.