Honkai: Star Rail Myriad Celestia Trailer shows Ever-Flame Mansion characters

We already got a taste of his flame-powered abilities on Herta Space Station. He’s the boss of the Annihilation Gang’s Ever-Flame Mansion and seems hellbent on destroying the followers of Aeons other than Nanook. During the trailer, he’s ordering his Children of Flame to infiltrate the celebrations on Penacony and go after members of certain Paths – which might mean that they are targeting certain characters invited to the world.

Akash is wielding a string instrument as his weapon, which is presumably how he got his nickname of The Tuner.

Duke Inferno told him to go after The Harmony, so characters like Robin or Sunday may be his target.

Dubra probably refers to the demon-like entity of shadow and flame. It looks like it's possessing the body of a little girl and uses it as a puppet, as symbolized in the trailer by the apple that looks pristine from the outside, but has a skeleton and purple flames on the inside. Duke Inferno said that he taught Dubra “mastery of the blade,” which may point towards her combat style.

Dubra is commanded to go after The Elation, making Sparkle her likeliest opponent.

Caterina is the passionate looking lady with the flail-like chain weapon. Inferno talks about granting her “blood of fire” and orders her to shatter The Preservation.

Aventurine will be the highest-ranked member of the IPC on Penacony, so he’s probably who she’ll go after.

Constance is apparently Duke Inferno’s best and most ambitious apprentice as he says that he has nothing more to teach her. Her order is to go after The Remembrance.

The Remembrance will be represented by Black Swan on Penacony, likely pitting these two against each other.