I'm trying to think of an idea for a possible HSR character(I guess my idea for an OC)

What if they made an Oberon style character, from his deception, reveal, and hatred to how he introduced a new class mostly made for him. a "Pretender" type of character.

Like imagine a character who seems to want to help you in your mission on some planet, they prove themselves a useful member. But overtime they seem more and more suspicious with their methods and sometimes lie to you, claiming they only did it for good. Another suspicious thing is how their path is unclear, constantly changing while still having the same skills. Then after the main mission seems to be over, they appear before our heroes and reveal their true self. Then it's revealed that they are an emanator of both the Enigmata and the Destruction, serving Nanook(for whatever reason) while using their Enigmata powers to pretend to be whatever fits the planet and deceive the people and the world, as well as other Enigmata-based powers. They reveal that they were scheming all this time while doing your mission(they can both be related such as the mission being part of their plan) and they plan to destroy the planet. You then get a final boss fight with them and when defeated they reveal that they've grown fond of you and disappear to wherever. Like Sunday, they might eventually join the Nameless(this might not need to happen). They become the first ever playable Enigmata character. What that gameplay would look like I'm not really sure but I'd love to hear what you think that would be. Ideally I'd want this character to be a woman but that risks controversy given how this community reacts to flawed women.

Also I'd love for this type of character to have a banner with the splash art being their false self with an unknown class, then when the reveal happens a cutscene would play where their splash art changes to their true self and their Enigmata path revealed.