Drusilla was born to Andrew and Eleanor Blackthorn in 1999. Drusilla is the sixth of seven children and thus has five older siblings: Helen, Mark, Jules, Livvy, and Ty, and one younger brother, Tavvy.
When Sebastian Morgenstern and his army of Endarkened invaded the Los Angeles Institute, she was at the nursery with Tavvy. Frightened by the noise and fire coming from outside, she got hold of a sword and determinedly protected him until Emma Carstairs came to get them. By the foyer, Emma stayed and let Dru carry Tavvy and go to the office ahead of her. They got there in time and were Portaled into Alicante.
After the raid, Dru and Tavvy were both very uncomfortable and had nightmares. Despite only being eight, Dru was also interrogated with the Mortal Sword, a tool used to painfully compel the truth out of a person. She and her siblings suffered through a lot during the Dark War, made worse by the loss of Andrew, who was Endarkened and killed afterwards, Mark, who joined the Wild Hunt, and Helen, who was exiled to Wrangel Island. Eventually, the family was sent back to the Institute, where they were to be raised by their uncle, Arthur.
At one point, Dru became obsessed with detectives, much like her older brother Ty—unlike him, however, Dru got over the phase. She read Nancy Drew books Emma got from a junk shop, citing them as good adventure stories that were nice to read about because it didn't have any demons.
In 2012, the Blackthorns visited their great-aunt Marjorie in England. During their two-month stay there, Marjorie had told her that if she wasn't shaped like a "butterball," she would be pretty and boys would do whatever she wanted. Emma was horrified and told her that she was in fact beautiful.
The Battle in the Convergence
While the others were meeting in the library, Dru was taking care of Tavvy by the seashore. Malcolm then appeared and told her that Julian needed her and that he was willing to play with Tavvy while she goes and joins the meeting. The others were just realizing who the Guardian was when she walked into the room; they were horrified when she told them that she left Tavvy with Malcolm because that meant he got the last thing he needed, Blackthorn blood. Dru broke down and wept when she realized what she had unwittingly done.
Dru then accompanied her family and Diana to the convergence to rescue Tavvy. During the battle she killed an undead Follower, her first ever kill.
A few weeks after the battle, Malcolm appeared at the Institute with a small force of sea demons, having resurrected himself with a spell from the Black Volume of the Dead. He threatened the residents to provide him with Blackthorn blood once again, and gave them a deadline before leaving and setting the demons upon them. Dru, on Diana's orders, Portaled to the London Institute with her siblings during the battle, leaving the visiting Centurions to face the demons.
While in London, Dru was left to take care of Tavvy, which annoyed her as she felt she was being treated as a babysitter and dismissed. Brooding in the parlor, she was shocked when a boy, Jaime Rosales, appeared. Jaime went on to tell Dru that he needed to see Cristina, but couldn't be seen just yet. Pleased that someone trusted her enough to confide in her, Dru hid him in her room and brought food up to him, all the while making him believe that she was sixteen, rather than thirteen. She enjoyed keeping him a secret from her siblings, as it made her feel important.
When Jaime thought the time was right, he had Dru fetch Cristina so they could meet. She was disappointed and sad when Cristina came back to her afterwards and told her that Jaime was gone, though she promised to keep Dru informed of what happened to him.
Back in her room, Dru was surprised to find Jaime's duffel bag still under her bed. Inside, she found a glowing object and, after touching it, found herself in a strange underground room. After exploring a bit, Dru came across a boy her age who mistook her for someone sent to help him. Before she could learn anything else, she returned to her room in the Institute.
Personality and traits
Drusilla is quite shy and often feels self-conscious about her body.
Dru has the Blackthorns' signature dark brown hair and blue-green eyes. She is quite tall for her age—nearly the same height as Cristina, despite being five years younger than her. As a child, she was already compact, expected to grow to be curvy unlike her mostly lanky siblings. Her body has since already gone through puberty early, showing off her curves to the point where Dru, at thirteen, has been mistaken for seventeen or eighteen years old by mundane boys. This has made her very self-conscious about her body because unlike most Shadowhunters who are wiry or muscular, she is round-bodied and doesn't fit into the gear designed for girls in her age group. She often wears her hair in two braids.
- City of Lost Souls (alluded to)
- City of Heavenly Fire (first appearance)
- Bitter of Tongue
- A History of Notable Shadowhunters & Denizens of the Downworld
- Lady Midnight
- Lord of Shadows
- Queen of Air and Darkness (will appear)
- The Wicked Powers (will appear)
Following the family tradition of Greek, and Latin, names, Andrew named her Drusilla after Caligula's sister.
- Dru is very competitive.
- Dru is an avid reader, and she likes horror movies, especially any with the words "blood," "terror," or "prom" in it. In fact, her room has books about serial killers and slasher films scattered across the floor; the walls are black, and vintage horror posters cover the windows.
- ↑ 1.0 1.1 City of Heavenly Fire
- ↑ A History of Notable Shadowhunters & Denizens of the Downworld
- ↑ 3.0 3.1 Lady Midnight
- ↑ Lord of Shadows
- ↑ Roman names, Cassandra Clare on Tumblr
- ↑ Reader, Cassandra Clare on Twitter
- ↑ Little fact, Cassandra Clare on Twitter
- ↑ Big reader, Cassandra Clare on Twitter
- ↑ Something about Dru, Cassandra Clare on Twitter