For members of 5D to guess

His name precedes him. Impressions of him are ingrained in the minds of the principal and teachers. All his classmates and a good number of his peers know his unusual idiocyncracies. On an average day, as his form teacher, I could perhaps rail at him several times for all kinds of misdemeanours. Yet, for the real handful that he is capable of being, I must admit that he is certainly one of the most unique personalities that I have come across. Who is he?