The archangels at Hogwarts

After a crazy summer Harry Potter, just wants a normal year at hogwarts. But with Voldemort, back the minestry of magic trying to smear his name, and 4 weird new proffessors it looks like he wont get that. Just who are Michael,Lucifer,Rapheal and Gabriel. Are they on the light or the dark side, and why do they seem to know so much yet so little about magic. Harry dosen't trust them.