Not much is known about Jillian. Some say that Pyro hid and destroyed her history, including the end of her family.

She had also been mind broken and fakes a smile to hide her pain.

Her original eyes were hazel until they became dark Grey after the countless torture from Pyro. She was also forced to wear a fire ring that was given from Pyro and couldn't be taken off. Fire spirits beyond the level can't remove it either and are destroyed immediately upon trying to remove it.