@axelmagquilat6734

its more likely that akivili never reached earth.

@darwisybinsaardin8712

Turns out Void Archives left behind "Shush", a drink bot who manages to even anger Himeko in 2.7

@staragon6716

I thought it was March and Firefly, no? Since March is fighting to find out her past and Firefly is fighting hard for her future.

@Darklight014

5:22 For the ones that might didn't get it Himeko in honkai impact 3rd Died to save the life of her student Kiana

@tiffiees

saw void archives in the thumbnail and immediately clicked

i noticed a few similarities that welt and void archives have, such as void archives wielding the core of reason from the previous era while welt wields the core of reason from the current era, as well as their initial shared goal to stop the honkai (even though they both have different stances on the importance of humanity alongside that goal; with welt caring significantly more about the survival of humanity compared to va), and if void archives joined the stellaron hunters its definitely plausible for them to be each other's parallels

as for void archives' reason for joining the stellaron hunters, i think it's possible for it to be related to star rail's equivalent of the honkai, or possibly even the sky people, but another potential reason could be for the pursuit of knowledge. void archives is said to have endless knowledge, however its most likely limited to knowledge related to hi3, and star rail's world could have new information that he never knew of, which could be useful to him

@triple3slash5

Where I think this theory video stalls, even if the hypothesis (VA is a SH because he is Welt parallel, important to Elio and has a goal in mind that could be used by Elio as leverage) is taken as-is, at the most basic part: What does Void Archives provide to Elio as a strategic benefit that would necessitate him to be part of the Stellaron Hunters?
Now since I so rudely poked a hole in the theory, allow me to patch it up in the same breath. But first, we need to visit the Xianzhou for a little bit, I promise this is going somewhere.

The Matrix of Prescience Ultima (stay with me here) is an incredibly complex divination machine. Importantly, it uses information to CALCULATE the future based on: šŸ“Œinformation it is fed (space, time, cause&effect) + šŸ“Œthe input of the diviner + šŸ“Œaccounting for the fact that a calculation is happening. This results in accuracy to such an extent that it has convinced Master Diviner Fu Xuan that the future is INHERENTLY PREDETERMINED.
Notice the pins I've slapped in there, we'll get back to them.

Let's talk about the Stellaron Hunters as an organization. Their stated goal is to create a future where everything is the same, hopefully, except Nanook is the one who gets skill issue'd as a result of the great final battle. Taking into account what we know for sure the Stellaron Hunters do, factually, to ensure this future comes to be it becomes increasingly clear why Elio needs who he needs.
- Elio needs Kafka to control variables subtly be it via mind control or assassination, so as to keep some factions quiet and out of the way.
- Elio needs Blade because he is an IMMORTAL asset, something he can use as a nearly guaranteed Get-Out-of-Jail-Free Card, a key that unlocks any door.
- Elio needs SAM/Firefly because of her sheer destructive power. If there is a mountain that needs moving to ensure a script goes right, SAM is sent in to burn it to a quarry.
- Elio needs Silver Wolf not just to have a good PC built and an older sister to beat all the bosses for him, but also to hack in enough money and Aether Edit things into their favor, a trump card strategy when there's no other choice, like in HSS during the game's intro. Kafka alone couldn't finish the job, and brute-forcing anything on HSS risks compromising the future of the Trailblazer making it to the Astral Express. Silver Wolf has subtle and niche capabilities to solve issues none of the others can.

And that "can solve issues none of the others can't" applies broadly to all of them. Blade can't mind control a pack of Borisin to go away, Firefly can't keep coming back from death to break Silver Wolf out of her IPC gay baby jail following a heated invasion of their server room because her accounts got binned, Silver Wolf... Well she's not really gonna be able to fight off a locust of Lesser Sting on her own like Firefly or Blade can.

So we know their uses, the Stellaron Hunter Operatives are all Elio's "keys to power", individuals who receive "scripts", laundry lists of instructions (or in Firefly's case, singular directives) that Elio needs to be followed to the T in order to insure a positive outcome or favorable future.

Let me briefly establish Elio here before I move on to my theory about VA. Elio is described to have "the ability/curse to foresee future possibilities." Elio, through some means, can see into the posible futures that may befall the universe. That however begs the question: How or why does Elio know that Nanook will win, and why is he even operating the SH if he knows the chances are miniscule?
I'm making an educated speculation here, but:
Put blatantly, Elio is using the SH Operatives to manipulate causality. He does this because his power isn't simply foresight of potential futures, I believe that Elio is the sole Emanator of Finality, and his power is based on PROBABILITY CALCULATION. He uses the Operatives to set up favorable cause & effect, manipulating chaos theory towards a better outcome that he can foresee thanks to the power provided by Terminus directly. 
The reason why I believe this is the power of Terminus (or maybe even just Nous, but Terminus makes more sense) helping is because Acheron, ACHERON OF ALL PEOPLE, is missing from his script. Acheron is directly stated to be immune to the influence and power of the Archons, and we even see this when she helps Welt sneak into Dewlight Pavillion, taking Sunday completely off guard having hidden them from the Harmony and also probably also Gopher Wood's mindful, everpresent Order.

So, if Elio has all the means to manipulate cause & effect as is, why does he need VA in his roster?
Let's look back at the Matrix of Prescience Ultima's conditions for accurate foresight: information related to the divination is fed in combined with the insight of the diviner and an extra instance of the calculation takes itself into account. This produces nearly 1:1 predictions, and concerns some diviners because they believe the act of observing the future so closely "locks fate" into that outcome.
I believe Elio is lacking something the Matrix of Prescience Ultima has and desperately needs it for his plan, that being an "input".
Think about it this way: The MoPU uses Time/Space/C&E to divine the future based on the diviner operating it, but add a third party and you get information extraction.

I think VA isn't a Stellaron Hunter right now (2.4), but will BECOME one in the near future, and his role? He will be a source of information about Honkai energy and a new data source/pivot allowing Elio to narrow down potential futures and make more detailed scripts. Because remember, Void Archives IS an archive. In fact, tying back to HI3rd, (spoilers for A Post-Honkai Odyssey) it is outright a shard of Prometheus, a "Super AI" meant to store info about and predict oncoming Honkai assaults. This kind of data, even if potentially incomplete, is invaluable to Elio if my blind guess at the reality of VA's interest in this universe is right.

I think Stellarons and their radiation are a form of Honkai, a shard of power stolen from the Finality. Potentially HI3rd's Finality. This gives VA reason to stick to the Stellaron Hunters like glue, because they're doing the same thing he's HARD CODED to do: Eliminate Honkai, at all costs. Even human costs.

In summary: My hypothesis is that Elio is an emanator of Finality, his power works similar to the Matrix of Prescience Ultima by calculating variables through presently available data and collapsing chaos theory to reach broad strokes predictions for potential futures depending on how events in the universe pan out in the NEAR future. He sends out Operatives to influence current events and remove ALL stellarons in the interest of a future where Nanook is taken out. Known or unknown to the Stellaron Hunters (and possibly the HSR universe as a whole), the Stellarons are actually a manifestation of Honkai and Void Archives is programmed to despise them and seek their erasure from existence at all costs, lining up with how Elio and the Stellaron Hunters operate (see The Jepella Rebellion - Scene 47). VA agrees with their methods, and serves as a vital source of data about Stellarons, their behavior potentials and possible targets for Elio's data-based predictions. Hence, eventually VA becomes a Stellaron Hunter, just not an on-field operative.

Bonus theories:
- Elio isn't actually a cat, the cat is a puppet present for important missions as an emergency course correction apparatus. Elio needs data for how things went wrong in the moment to make them right again, so the cat is his "sensory proxy".
- VA got kicked off the Astral Express because he wanted to destroy a Stellaron by ramming the Astral Express into it, almost succeeding and traumatizing everyone in it. He promptly gets chewed to shreds by Himeko and Pom-Pom and dips because "everyone here is a loser virgin anyway, see you around Joachim".
- There's a good chance Luocha and VA have met, and my wild speculation is that Luocha used some aspect of VA's knowledge to manufacture the situation with the Ambrosial Arbour/Jingliu and that interrogation in the Shackling Prison.
- The Trailblazer's limited choice in responses in universe can be described as Elio's meddling, or perhaps even that of Terminus, collapsing all the various possible dialogue choices a player might make into a handful of responses that all follow broad strokes of what the Trailblazer would potentially say in that moment, providing the player with the highest net variety of choice while constraining to the script. You. The player. Are following the script.
- At all times.

@heilamwether8911

Tbh, kinda took more like,

Himeko-Kafka 

Blade-dang heng

Firefly-March 

Silverwolf-trailblazer

Pom Pom- elio

Then welt - n/a

Since welt wasn’t a native to this universe, and VA is off doing his own stuff. 

It’s believe that the stelleron hunters are the future versions of the path of trailblaze, due to their similarities with the current crew of the express, but that’s just a running theory. (Especially with it being totally possible that akiveli becoming terminus due to reaching the roots of the imaginary tree, and being a different aeon, and after his departure, a good bit of the crew started following the aeon of finality.)

But this is all speculation :/

@LcveFool

This is my I love honkai so much lol, the lore and theories just keeps getting better and better.

@Marbeary

I like that in both game series (HSR and HI3) Void Archives is Sus.

@AnArtistInAVoid

If anything were to be considered the equivalent to honkai in VA’s perspective, I think that would be the Anti Matter Legion, simply because of their blatantly destructive end goal.
Taking this into consideration, Elio might have revealed to VA the possible future where Nanook, and by association the Anti Matter Legion, is destroyed, which would be enough motive to recruit VA onto the Stellaron Hunters.

@Mixtrelle

8:54 it's now confirmed Welt's home planet is out of the silver rail from hi3 main story part 2 chapter 5. whether it is Amphoreus is still unknown.
just want to add another point which connects Void Archive and Welt. VA is a divine key made from the core of herrscher of reason, which Welt had been before he passed it down to his successor. VA may or may not be stellaron hunter but it might be used as character development for Welt in the future.

@hollowficate

10:58 *50000

Based solely on VA programmed and his influence,  I can pretty much guaranteed he won't work with Elio. It doesn't truly benefit him. Interesting theory tho.

@SleepIsLife726

Does anyone remember if emperor Rubert could control not organic beings? Even if not Void Archives could be intruduced at the same time since Rubert is forshadowed to come back due to screwllum and inteligensia guild looking for his grave. As a HI3 player I can't wait for star rail story to actually get more dark!

@akibiyori

The way I see it:
Pom Pom=Elio (one is bound by the Express and symbolizing Akivili’s goal focusing on the journey, the other is Destiny’s Slave and focusing on the end of the journey)
Himeko=Kafka (both are leaders in their respective group)
Dan Heng=Blade (one wants to move on from their past, the other is tormented by it)
March 7th=Firefly (one wants to discover their past, the other wants to find the meaning of life, and both were found floating in space)
Welt=Silverwolf (one sees the world with infinite possibilities and the other sees the world as a game, Welt is also from HI3 and SW is a variant of Bronya in HI3)
TB is simply TB - they were created to host a stelleron and raised by the SH & now host a stelleron and adopted by the AE

@bongy-o1q

Please I need void archives to come back

@angelareader932

I wonder if Luocha and VA have met before.

@GabeDuncan-v9q

Or void arcaves

@therenegade4482

Imagine if void is actually elio

@AlexDoesntArt

Honestly your theories are so big brained that if ever HSR finally reveals the truth about void archives, I’ll be like ā€œHERE!! SHE SAID IT FIRST!!ā€

But okay girl tell me more about the song you mentioned 😮

@duongnguyen-s1i

also in the picture where there are all the stellaron hunters, there were crowsss soooo maybe VOID ARCHIVE IS A CROW. jk