This article contains plot details from the latest book.
“So the fact that you never wear your hood–is that a protest? Or because you want everyone to see your awesome bangs?”
Glimmer's Identity Theories Edit
Despite it being a long shot, some fans believe Glimmer may be Mai Song, Tam and Linh's mom. First off, both Glimmer and Mai have long, straight ebony hair, as do Tam and Linh. It is said in the Tam Short Story from Tam's POV that Glimmer sounds like Linh when she speaks. She also revealed that she cared about Tam during his stay with the Neverseen, often checking on him and trying to become his friend. Mai Song/Glimmer was likely recruited to the Neverseen by Lady Gisela. Lord Cassius briefly mentioned that he knew Quan Song (Mai's husband) and they sometimes met up. It would make sense for Lady Gisela and Mai to then hang out together, and when Lady Gisela noticed how powerful a Flasher Mai was, she may have invited her to join the order. Mai also seemed to regret letting Tam and Linh get banished, so she may have been angry at the Council, and joining the Neverseen might have been her way at getting back at them. She could have been mad at them for not silencing the prejudice on multiple births, too, since she maybe felt pressure to say that her children weren't twins (not to say that what she did was right).
Additionally, this would mean that Mai Song is a Flasher, while Tam is a Shade, and the two abilities may have the same core, similar to Empaths and Enhancers. This would explain why Tam is a Shade. Glimmer is said to be an extremely powerful Flasher, and both Tam and Linh are talented ability-wise as well.
They are both Flashers, and they both have long black hair. When Luzia is mentioned at the beginning of Legacy, she was apparently "waiting to be sentenced" and we heard nothing more from her. She has always been cunning and is known to keep secrets. She is also known to be a powerful Flasher and would thus be able to make the ethertine bonds that Lady Gisela had put on Tam. She has worked with Vespera before, so maybe Vespera/Lady Gisela recruited her. She could have joined the Neverseen for any number of reasons, but after the "Scandal at Everglen," she is probably bitter towards the Councillors for her tribunal and she is maybe even a little bitter towards Sophie and her friends for exposing the hive at the Celestial Festival (even though that was Vespera, Lady Gisela "has proven time and time again to be a master of mind games and manipulation".) She has also proven to "change sides" from working with Vespera to helping Sophie save Wynn and Luna. She might not want to show her face because she betrayed Sophie and her friends by not telling them about the troll hive at Everglen.
Fans speculate that Jolie could have been forced to fake her death and join the Neverseen. In Everblaze, it mentioned how she loved Brant up until the end, but if that wasn’t the end, she would have been committed to the cause after he died even more if she still loved him, explaining the comment that she is one of the most committed members they’ve ever had. She could be working with a Flasher to save light and then conjure it, making her look like a Flasher even though Jolie is a Conjurer. She snaps her fingers to move already-existing orbs of light, something that Wylie, Elwin, and other Flashers never have to do. They only flick their wrists to move light, although they do snap to create it. Glimmer snaps her fingers just like a Conjurer, which Jolie was. Glimmer is described as having long black hair, unlike Jolie’s blond, but she had Raven LovelyLocks (black hair dye) on her desk. The reason she might not lower her hood is because she might be scared to face Grady and Edaline after over 17 years of them believing their only daughter was dead. Her age is also similar to that of Glimmer.
Glimmer may have been a genetic experiment made by the Neverseen, ordered to spy on Tam and the rest of the Black Swan. Lady Gisela also says that Glimmer is more loyal to the cause than anyone she’s ever met. She could also have been forced to join, or kidnapped by the Neverseen, and have realized that the Neverseen was doing too many wrong things, so she left.
Lady Cadence Talle is a Polyglot, which means she can Manifest twice. She could've manifested into a Flasher. Tam said that she sounded like Linh, and that may be because she is good at mimicking. Her hair is raven black, and she might have been with the Neverseen in the first place and was sent to Mentor Sophie in Foxfire to spy on her. That could be why the Neverseen knows so much about Sophie and her friends. She might not lower her hood because she is scared of what the Councillors will do because they thought she was trustworthy. The Neverseen might have tortured Fitz and Keefe so much because they knew how much Matchmaking meant to her, and they wanted Sophie to cooperate. Lady Cadence Talle could tell them that because members of Team Valiant went to investigate her to ask her if she was Sophie's biological mother. Lady Cadence might have run off to join the Neverseen because she was stuck living with the Ogres. However, Lady Cadence is already a Polyglot and Conjurer, so this theory isn't perfect. But like we said with Jolie, she can conjure light.
- Lady Gisela's daughter
Lady Gisela always wanted a son, which could mean that Glimmer is Keefe's sister. This explains why she went willingly with them at the end of Legacy. Lady Gisela could have taken Glimmer to the Neverseen to raise her, which is a reason why Lady Gisela said, as previously stated, that Glimmer is more loyal to the cause than anyone she has met.
Glimmer is said to try to befriend Tam, and we know that Coach Rohana was his coach at Exillium. They both have long, black hair, and we don't know what Coach Rohana's ability is. Lady Gisela also mentioned that Glimmer was more devoted to their cause than anyone else, which could suggest that she was banished or wronged by the Council. We also know for a fact that all 3 Exillium Coaches have some dislike of the Councillors.
- A previously unknown character
Although Glimmer has many traits in common with other characters, there are also many contradictions that make them unlikely. It is mentioned that Glimmer has long black hair, which she has in common with Linh and Mai Song. However, black hair is fairly common, and anyone could use black hair dye, such as Jolie is speculated to have used. Glimmer also is noted to be a girl, or someone of a younger age, which makes many of the fan theories unlikely.
She seems to have been living with the Neverseen for a relatively long time. If Brant had a daughter he would most likely want her to be in the Neverseen. Jolie died over sixteen years ago, and the girls' age is presumed to be around 16. When Tam was talking to her she said "Hey, you're asking me to betray-" She could have been trying to say they were asking her to betray the people she grew up with.
Glimmer seems to be very reliant on trust. That could do with the fact that she might be half human. Her parents' relationship would have been invalid, so she would probably been hidden away from the council like Sophie was. Then her dad dies in the car/bus accident and her mother becomes bitter and leave her. She would be all alone, feeling betrayed by both worlds. Then Lady Gisela comes and promised to change the world for the better. The Neverseen eventually become her family.
Quan and Mai Song are known to care a lot about appearances. They are shown to be ready to use harsh methods to protect their appearance. If they had triplets, they could have given one of their children away. She could have been recruited by a member of the Neverseen who was in the Lost Cities. Quan and Mai's abilities are unknown so if one of them was a Telepath (a washer) then they could have erased Glimmer from Tam and Linh's memories.
Cyrah Endal had contact with the Neverseen, and it would not have been difficult for them to fake her death. This would cause a distraction and draw the Black Swan's attention away. She could have joined the Neverseen after Prentice's mind was broken because she was so mad at the Council for ordering it. Also, Cyrah is a Flasher like Glimmer, and like Jolie, she can dye her hair black.