The most amzaing charcter of all time in the triology, Infernal Devices, by Cassandra Clare.
Will Herondale is described as stunningly attractive, witty, and heartless. His best friend is Jem Carstairs and they both end up falling in love with the main charcter, Tessa Gray.
Will is a shadowhunter (a person who huntes demons) at the London Institute, in the late 1800's.
“I shall charm him with such force that when I am done, he will be left lying limply on the ground, trying to remember his own name.” Said Will Herondale. "The man is 81 years old" Said Jem, 'that may happen anyway."