Just yesterday, the official Honkai: Star Rail channel released the Myriad Celestia Trailer: "Anti-Destruction Alliance". It's finally a serious one, featuring appearances from a large number of new characters. Let's take a look at the Paths and relevant information for these new characters!
1. HSR Version 4.0 - The Path of Preservation
The Interastral Peace Corporation's "Strategic Investment Department" initiative calls for the entire galaxy to unite against Destruction. Pearl of the Ten Stonehearts sends invitations across the galaxy, inviting others to join the "Anti-Destruction Alliance" and gather in Planarcadia.

This is Planarcadia, known as the Land of the Full Moon.

On the right is Opal of the Ten Stonehearts; on the left is Pearl, who has changed her outfit. Opal mentions wanting to lure someone into the game but keeps it a mystery, not revealing who it is—possibly the Trailblaze.

2. HSR Version 4.0 - The Xianzhou
Our long-awaited helper - The Xianzhou will also make an entrance in Version 4.0 because Yao Guang calculated that remnants of the Abundance would appear.

3. HSR Version 4.0 - The Path of Erudition
The young boy appearing in the PV is named Stephen Lloyd, the youngest member of the Genius Society. The Genius Society was formed to research the Leviathans.

4. HSR Version 4.0 - The Hunt
The PV also features "out-of-print" characters Galaxy Rangers - Boothill and Rappa. We haven't encountered them in the universe for so long! Very much looking forward to it! However, the "combat maid" behind them is actually the new character.

The new character Ashveil is also a Galaxy Ranger and might be the leader of the Galaxy Rangers, La Mancha. The Company wants him to investigate the disappearance of an Aeon, but which Aeon is not revealed—it might be Akivili.

5. HSR Version 4.0 - Harmony
The Harmony faction will welcome a brand new, unknown character, but it is known that she belongs to the new Harmony sub-faction, the Blissful Ball. Meanwhile, in the PV, Robin states that she will investigate the company's intentions.

6. HSR Version 4.0 - Elation
The highly anticipated new Elation character is, of course, Sparxie. Sparxie says that upon arriving at the Elation's Planarcadia, one must follow the rules of the Masked Fools. In the segment introducing Elation, there is a twin-tailed Sampo on television—it's unclear if it's a parody by Sparxie or a new SP version of Sampo.

7. Evanescia

8. Unknown Character

9. Nihilux

10. Lord Ravager - Asat Pramad

It's worth mentioning that in the PV, Himeko also appears in Planarcadia. Later, the Trailblazer prepares to touch the Elation mask, directly hinting at the upcoming unlock of the Path of Elation.
Finally, there is a monologue by the Elation Aeon Aha, but it is delivered in Asat Pramad's voice, speaking of bringing destruction within joy, and the figure then transforms into Asat Pramad. Could Aha and Asat Pramad be the same person? Or perhaps this Aha is impersonated by Asat Pramad? One of the bosses in Planarcadia is certainly Asat Pramad.

11. HSR Version 4.0 - Stellaron Hunters

Speaking of the Stellaron Hunters, conflict with Aha is unavoidable, and the Stellaron Hunters have unlocked new powers. Blade transforms into a red-clad form. Elio returns a cartridge to Silver Wolf. Silver Wolf transforms as if putting on an "Infinity Gauntlet." Silver Wolf's twin-tailed, twin-turbocharged SP form is super cool.
A large number of new characters are making their appearance, which is highly anticipated. Moreover, the storyline in Planarcadia is a massive free-for-all involving various Paths, with many familiar old friends joining in. So, which new characters are you most looking forward to? Feel free to share your thoughts in the comments!