I explained why I thought she was a fanfic character type, so check that out.
Thanks, yes, I read your explanation:
Burnham is akin to an author self-insert into a fan fiction. She's awkwardly wedged into the Star Trek mythos for no apparent reason beyond a need to connect the show to TOS. People will bring up Sybok at this point; okay, fair enough. But at least Sybok sort of makes sense. It's not a stretch to say Sarek had a son with another woman before Spock. That is mostly reasonable. But to say Spock has a HUMAN foster sister all of a sudden when Spock's whole character arc was centered upon his acceptance of his human side? Come on.
And my question stands. How is she a fan fic character?
She hasn't been awkwardly wedged into the existing story, has she? I'd argue that Michael makes as much sense as Sybok, especially in light of Sarek's obsession with humanity, which apparently includes multiple human wives. Kind of weird. It seems quite reasonable to me that he'd foster a human child. And given Spock's lifelong struggle with emotion, it makes sense that his siblings would be part of that struggle.
Maybe I'd agree if they had used Michael poorly, but she's been richly and consistently built as a character in her own right. In Season One, Michael is introduced to us as an extremely competent officer who avoids social engagements, which allows her to advance technically without developing emotionally. She never figures out how to have human relationships, never has to deal with her underlying trauma and her prejudice against Klingons. It backfires for her. When pushed emotionally, she mutinies, then martyrs the enemy to protect emotional connections. She retreats into logic, covering up guilt rather than engaging with it.
Michael's story in season one is about how developing as an advocate/mentor (to Tilly; for the Tardigrade; for broken, increasingly confused Ash) enables her to grow emotionally and find her humanity. Doing so allows her to embrace the emotional complexity of friendships and love for the first time. By becoming able to see and value the humanity in others, Michael eventually recognizes that the Klingons, too, are human. She sees the underlying prejudice that motivates her and makes the decision Starfleet couldn't: rather than using war as a shallow means of atonement, she embraces the humanity of her enemy and ends the war.
In season two, she's on a quest to address her failures of emotion, and to do so with a sincerity and humanity that she wouldn't have known how to manage without going through Season One. But she must also deal with the fact that her emotional growth has been almost entirely about caring for others. Spock calls her on assuming others' burdens, and that seems to be a stumbling block for Michael right up to the present.
To me, that's a strong character arc, and one that gains nuance by involving Spock as someone equally split between worlds. Whether or not you like her, though, I still find it hard to see how she's fan fic.
Maybe the question is this: if she's an author proxy, what vicarious satisfaction is the author gaining by creating her?