Zepar incites love and passion between the sexes. He can make women barren and can cause one to shape shift.
Zepar is the Greek God Zephyros and is also known as Zephyrus.
Here is part of an excerpt from http://www.theoi.com/Titan/AnemosZephyros.html
“ZEPHYROS (or Zephyrus) was the god of the west wind, one of the four directional Anemoi (Wind-Gods). He was also the god of spring, husband of Khloris (Greenery), and father of Karpos (Fruit).
Zephyros was portrayed in classical art as a handsome, winged youth. In Greek vase painting, the unlabelled figures of a winged god embracing a youth are sometimes identified as Zephyros and Hyakinthos--although other commentators interpret them as Eros (Love) with a generic youth. In Greco-Roman mosaic the god usually appears in the guise of spring personified carrying a basket of unripe fruit.”
Being a “Wind-God” Zepar has power over the element of air, which is in the soul. Beelzebub, in addition to being a God who has power over insects and the occult discipline of using insects for divination, is also a very powerful God of wind and air.