|“||Well, I’m not a goddess of healing, but I’m still a goddess. I think I can take care of my little brother’s boo-boos.||”|
–Diana to her brother after healing him of zombie poison in, The Tyrant’s Tomb.
Diana is the Roman goddess of the hunt, the moon, woodlands and childbirth. Her Greek counterpart is Artemis.
Diana, in Roman state religion, is the goddess of the hunt and the moon, woodlands and childbirth. It is believed that Diana was originally a local woodland deity, invoked by women to aid in conception and in childbirth, and that her cult originated in Aricia. One of her most famous places of worship was the grove of Diana Nemorensis (“Diana of the Wood”) which was located on the shores of Lake Nemi, in Aricia; there Diana was associated with Egeria, a water-nymph who served as the goddess' midwife, and the hero Virbius, said to be the first priest of Diana’s Arician cult, called the Rex Nemorensis (“King of the Wood”).
In Rome, Diana had her own temple on the Aventine Hill which, erected around 540 BCE, was based on the Temple of Artemis at Ephesus; Roman tradition holds that it was originally dedicated on August 13 by the fifth king of Rome, Servius Tullius (c. 575–535 BC), and its location on the Aventine, situated just outside the pomerium, was compliant with the tradition that Diana was a deity common to all Latins, not exclusively of the Romans.
Diana was also considered the protector of the lower classes, especially slaves; slaves could receive asylum in her temples, a custom that was seen in Ephesus, and her chief festival, the Nemoralia, held every year on August 13, saw slaves be free from their duties. In art Diana was usually depicted as a huntress with a bow and quiver, accompanied by a deer or a hound.
During the Battle of San Francisco Bay, she responds to her brother’s call for divine help, kills Tarquin, and heals Apollo of his poison. After the battle she asks Lavinia Asimov to join, but the daughter of Terpsichore refuses, disappointing the goddess.
Diana resembles her Greek counterpart greatly, taking the form of an adolescent girl with long auburn hair tied back in a ponytail and silvery yellow eyes. She wears silver camouflage clothing.
Diana is said to be more hostile, isolationist, and associates herself more with what the Romans think she is. 
Despite her quick temper, she has a soft spot for her twin brother and misses him during his third time forced to be human.
- Archery: As the goddess of hunting and archery, Diana is gifted with archery.
- Lunarkinesis: As the goddess of the moon, Diana has control of it.