

Sydney usually wears very formal neutral colors and, like the other Alchemists, very rarely wears bright colors. After reeducation in Silver Shadows, she is a lot skinnier, malnourished, and able to count her ribs. The moral support and many compliments she receives from him seem to help her gain some confidence in herself.
SAGA OF SIDNEY SPACEPIG SERIES
As the series progresses, she becomes better about her eating habits with the help of Adrian Ivashkov. This is problematic since Sydney has a very different body shape than Moroi. He told her once that "if those monsters (Moroi women) could do it, so could she." Working as an Alchemist in the field, she has come to idealize Moroi women's body shapes as something she should strive to replicate herself. It is rumored that these issues may have come from her verbally abusive father. This becomes evident early on in the Bloodlines Series. As an Alchemist, her cheek adorns a golden lily tattoo infused with vampire magic however, in Silver Shadows, it is seen to have bits of silver in it. She wears expensive makeup, applied to give her a natural look. According to Adrian, her eyes are molten gold when she stands in the light. Sydney has layered dark golden-blond hair that reaches just past her shoulders (although it grows longer and longer throughout the series) and brown eyes that turn gold in the light. It is revealed that while some children were learning their alphabet, her father was already teaching her the basics of chemistry. Most of her intelligence comes from her rigorous homeschooling with her father, Jared. She is later seen learning magic and even becoming a witch, which comes very naturally to her. Despite everything, Sydney is said to have a natural talent (or "knack") for magic. Sydney does not like magic but is forced to learn it by her history teacher, who tricked her into an independent study for an elective. However, she doesn't get all of Adrian's artistic skills and often thinks she is simply not artistic or abstract enough to understand his art. She showed quick thinking when two Strigoi, Jacqueline and Dawn, drank from Adrian Ivashkov by using her fire amulet to incinerate them in Bloodlines. Sydney can also play volleyball fairly well. She confesses this to Adrian in The Golden Lily. However, her intelligence is sometimes intimidating, and Sydney often "dumbs down" things when speaking to people about them because she gets the feeling they don't really care. She is very educated in history, culture, mathematics, and almost every subject known to man. Sydney knows a lot about cars and architecture, and she has outstanding grades and quite a vocabulary. She has lots of contacts due to the fact that Alchemists must do "damage control" to keep the vampire world hidden. She can speak six languages, and she has many tricks and techniques for getting rid of Strigoi bodies, such as a special potion that can turn a dead Strigoi corpse into dust so it is unrecognizable. Sydney finally ends up going to college like she's always wanted to. In The Ruby Circle, they adopt Declan and move to Maine to have a safe life together. After escaping re-education in Silver Shadows, she and Adrian get married. In The Fiery Heart, her sister Zoe finds out that she and Adrian are together, and she gets sent to a re-education center. At the end of The Indigo Spell, she admits to herself that she loves Adrian, and they start dating. In The Indigo Spell, she agrees to let Marcus Finch remove the compulsion from her Golden Lily Tattoo. Throughout the next couple of books, Sydney begins to question her upbringing and The Alchemists more and more due to her relationship with Adrian and her exposure to witchcraft. He becomes one of her closest friends, along with Adrian Ivashkov, with whom she develops a very close friendship throughout Bloodlines. She later meets Edison Castile during her assignment. In Bloodlines, she is assigned to protect Jill Dragomir from a group of radical Moroi who are against Queen Lissa Dragomir's politics. She later becomes the narrator of the spin-off series Bloodlines.

In Last Sacrifice, she gets into deep trouble with the Alchemists for helping Rose escape prison. She first appears in Blood Promise, where she helps Rose Hathaway find her way through Russia, even though it clashes with the beliefs she's been taught her entire life. She was raised to think that all vampires are evil creatures of the night, even Dhampirs and Moroi, who are peaceful by nature.

She has an older sister, Carly Sage, and a younger sister, Zoe Sage. Sydney is a 19-year-old former Alchemist.
