There are multiple parts to Marcy's appeal, some are surprisingly unintended but are very much there and some are absolutely intended.
And the intended core (ha pun) of Marcy's character is this one frame
"I just didn't want to be alone."
That's where the writers intentions and the audience's perception of her match perfectly. A girl willing to go to immense lengths to not lose her friends, both because she loves them dearly and because without them, she has no one.
And she's genuinely convinced that she cannot make more friends due to a lifetime of failures.
So tell me please, whose great idea it was for her character to end up alone and proven right at the end?
At the end of the show, Marcy faced three newts. Two who never cared for her and one who did but betrayed her in all the worst possible ways.
At the end of the show, she heard her friend telling her that them drifting apart is okay because they'll always have the memories of each other. (I know it got clearfied in the journal that they texted every day for a year after the show but we shouldn't have to read supplementary materials in order to know this crucial detail).
She leaves a world where she has no one, and goes back to a world where she's about to lose the only people she had.
So it doesn't matter that she led a team on a mission, or that she had a nice day where she really clicked with another girl, because what's going to stay with her is the end line.
And at the end she learned that even if it looks like there's someone who really loves her, they'd either leave or have an ulterior motive and want to use her.
(She's used to be used, actually. Who did most of the work in school projects back home? Canonically Marcy. What was her to-go strategy with trying to befriend Newtopia and Wartwood after a straight forward attempt failed? Being useful. Why did Olivia and Yunnan try to get her out of the healing tank? So she could help them against Andrias.)
And not only that, she learned that she deserves it. Because look at what her efforts to avoid being alone brought.
So with that in mind, picture Marcy in an entirely new school aboard. What is she going to do?
Because I doubt that she's going to try to make friends.
tangentwithtanner
janainaart
blakekathryn
ellievsbear
gummygunk
