Biana Vacker

Biana is very loyal. She is always there for her friends. She can be wary of people she doesn't know very well or trust⁠ – like how she treated Sophie in the first book—but once she gets to know someone, Biana will become an extremely devoted friend. She would risk her life to save her loved ones when she does get the chance. Biana hates being left out and wants to help Sophie in any possible way. She may be in Fitz's shadow, but that doesn't stop her from trying to shine. In Neverseen, when Sophie and Fitz jump off the cliff to go save someone who might be in danger, Fitz stated that Biana had "tried to come too, but [their] coach grabbed her" before she could succeed

Biana is a bubbly and outgoing person to be around. She's a talkative elf and is usually the one to spark a conversation, gossip about rumors, or talk about the latest trends. Biana is the type of elf who will always try to find the good in a bad situation. She is also shown to be intelligent and can prioritize, multi-task, and handle her responsibilities well. An example of her intelligence is in Neverseen, when they are in the forest with Ruy, she thought to throw her monocle at the force field, causing a white fire that tore through it. Biana was in the Left Hemisphere at Exillium, showing her level-headedness and ability to think logically. She is also very responsible.

Biana is very hard-working. She always wants to help and will work hard on a task until it is done. In Legacy, Biana becomes part of Team Valiant. Every time Sophie gives her an assignment, she puts all her effort into it and gets it done before Sophie even has time to check in with her on how it's going. When Sophie resets her abilities in Legacy, she stays on task and does the work for Sophie while Sophie heals

Biana is a very intelligent elf. She is very diligent and knows how to manage her time. She's quick to shoot a comeback at someone if they mess with her, and this takes a lot of wit. She handles her responsibilities incredibly well and is shown to have a calm head under pressure, as shown in any book where they face the Neverseen. All though in Flashback, she is said to be leaning on Dex and Tam when Fitz is punching Alvar, she quickly recovers from her initial shock and fights bravely. She figures out many of the Black Swan's or Neverseen's puzzles and clues, and she is able to pick up on new skills quickly and retain information.

Biana is very brave. In Everblaze, Biana tackled Lady Gisela when she tries to take Keefe. She almost falls off a cliff, but she still takes the risk. As shown in Nightfall, she single-handedly took on Vespera and Fintan, the two leaders of Neverseen. She gets brutally injured but still claims that some risks are worth taking. Biana may act feminine most of the time, but she is not a delicate elf and is willing to fight to the death in order to save the people she loves. Confident and bold, Biana isn't afraid to tackle challenges, and have some fun along the way.

Biana is also shown to be a wary and suspicious elf, as many people have tried to use Biana to get to Fitz, which is why she disliked Sophie at first—assuming she was going to do the same thing. In addition, since she's a Vacker, so everyone wants the best from her, and some would even use her just to benefit themselves. When nervous or worried, Biana twists her fingers as if she's hoping for something— like how Sophie pulls out her eyelashes.

Even though Biana has gone through many challenges, such as her fight with Vespera, she stays confident in herself, mainly in her beauty in style, which at first made Sophie believe her to be vain and bratty. She is good about not letting anybody break her, and always being true to herself and friends. Biana has been found to use her confidence in games like bramble where she has been known to knock people into the lake.

Although Biana has had many difficulties and sadness in her life, she is hopeful and optimistic that someday, things will change, the Neverseen will be defeated, and Alvar will come back. This is also hinted in the fact that Biana is very courageous. She never gives up in what she believes in, and pretty much does everything to open and show it to the world.

At times of distress, Biana tends to treat people unkindly or unfairly, like she treated Sophie in Keeper of the Lost Cities, mainly because she thinks that people use her to "get to her brother."

Throughout the series, there were multiple instances where Biana noticed small details that no one else managed to find. Though she has no photographic memory, she seems to remember things very well, nonetheless. She pays close attention to those around her and, as a result, is able to know what others need even when they don't state so explicitly.