A start of a song: Dirty Harry Potter

My robe is black as midnight, my cloak more sheer than glass
I know some nasty hexes that'll knock you on your ass
Better cower and pray or I'll blow you away with my .44 caliber wand
Surrender fast or else the blast will knock ya halfway cross the Pond

Chorus:
I'm Dirty Harry Potter and ya better not mess with me
I'm not some whiny little brat you watch on your TV
I take no pris'ners, have no fears
I beat the bad guys every year
I'm Dirty Harry Potter and you don't get best of three