Saints - J

Jesuits = The Society of Jesus, known more popularly as the Jesuits, is a religious organization that has its origins with the Order of Priests. For more info see Jesuits. 
Jesus Malverde = The honest-to-God Patron Saint of Drug Dealers. Jesus Malverde is a folk-saint which means he's not recognized by the Vatican (big surprise there) but is often portrayed as a Robbin Hood hero of sorts among the people of Latin America. For more info see Jesus Melverde. 
Joan of Arc = The femme fatale of the Catholic Church in France, Joan of Arc is both an icon for feminism as well as a major figure in French piety. For more info see Joan of Arc. 
Joculars = Priests who take a leaf out of the Trickster's book and use humor to help people overcome themselves. For more info see Joculars. 
John the Baptist = A popular religious figure in first century Israel, John the Baptist was cousin to Jesus of Nazareth and possibly had ties to the Essenes (hypothetical). Veneration of him will grant powers like those of the Philosophers. For more info see John the Baptist.
Jude Thadeus = Cousin to Jesus Christ and Patron of Lost Causes, Jude is prayed to by people when it seems like every other option has been exhausted.