I gotta say I really love your works and art and I really love how big you've built your world!

It's caused me to wonder three critical questions about the lore of the story that you seem to not have unveiled based around Doremi Lamprey: who was she in the first existence she occupied, how did she become who she is now, and who did she erase from existence? I have had some interesting theories for all three of them, but I've wondered the last one the most. I've theorized that its likely someone you've revealed by this point, because if its just some random somebody, it would be too anticlimactic, and after reviewing the evidence, I've come to a (likely wrong) conclusion of the person's identity. And considering you don't really have a male OC, the person would obviously be female.

From what we know, the team Isolde assembled all hold some form of combat capability. Isolde wouldn't recruit people who lacked combat capability or were unwilling to provide assistance, so it would be have to be a seasoned warrior with a willingness to be a hero. There would also have to be a certain attribute based on one critical event that they cause: Niji's death. I see two possibilities here: either she performs a reckless act to try to eliminate an enemy that gets Niji killed, or worse, she betrays the team and kills Niji herself, possibly for possessing a Hypnos that she would hate and could have expected support from Ruya over. Either possibility would indicate that she would seem to have a self-righteous, impulsive, or arrogant personality, something that everyone else in the team (barring Ruya a bit, considering her impulse to exorcise Niji's Hypnos) lacks.

From what you've told us about Doremi, it seems that even though she's a villain, she does have some standards. She does have a fierce love of her servants, guests, and children and took Shallot in as a guest. And what's more, when Isolde is left facing Doremi alone, with her friends in existential stasis, Doremi not only claims that everything she did was for existence, but is also talked out of things she's doing by Isolde who points out the wrongness of her actions, showing that she does have some sense of right and wrong. As such, I think that the person she erased may actually have been deliberately erased for possessing a negative disposition. Notably, the heroines never kill or seriously harm any of Doremi's servants or daughters, despite the fact that many of them try to eat them, even though on occasion the option was brought up, which may have contributed to Doremi deciding not to erase them. Quite possibly, the person who was erased had a more twisted sense of right and wrong than even Doremi's, or sought to or succeeded in killing her daughters or servants simply because she thought it was the best or right thing to do.

Also, notably, in order for the whole team to survive as much as they did, they would have had to have an extraordinary amount of luck, which could have emanated from the person who was erased. I think at this point, my theory starts to get obvious. In fact she could have been so lucky, that her resolve to do something that resulted in Niji's death would have guaranteed it, meaning that defeating her would be impossible by conventional means, as her luck would prevent any attempt to stop her, leaving the only option to eliminate her being cessation of existence. Perhaps even in the original timeline she tried to kill Doremi's children/servants and may have succeeded or was only stopped by the rest of the team persuading her otherwise, but changed her mind after betraying them, and tried again and later succeeding, prompting Doremi to erase her. With all of this inference of what the person was possibly like, skilled warrior, heroic resolve, potentially arrogant, impulsive, self-righteous, twisted sense of right and wrong, loathing of a Hypnos, and incredible luck, I've thought the possibility that the person who existence was ended by Doremi, was Odette Starfallen.

Of course, as I've said, I'm probably wrong. And the probability of a theory like this being right is minimal. Perhaps you really did intend for it to be a random person and I'm just reading into it too much. Just thought you should know that there is at least one person out there who really appreciates your work!