In last thread
someone wondered about what could be done with Jackie in s3 and I wrote all this reply and I won't let it go to waste dammit>>90537195
I think that the relationship strife with Marco will bring out some new sides to her. Probably some insecurities to make her more human, but I'd guess she'll also lose her cool. We might see her cry.
I think, only based on how quickly and efficiently she sprang to action against Ludo's rats in BBtBC, that she might want to come along with Marco to at least some adventures, maybe in an attempt to understand him better, and understand why he misses Star so much. It'd also be interesting to see her work through the betrayal of having considered Star a friend who was clearly supportive of her and Marco getting together, only to have Star pull a public love confession to her bf in front of her fucking face (and everyone they know).
In any case, I'd like to see her develop and become someone useful who could tag along on adventures. But before that she'll go through some character development with Marco and will probably somehow spur Marco towards thinking about who he is and what he wants and is this love that he's feeling, towards whom, and what is love yada yada don't hurt me
Or she could turn out to have some magical creature powers. Like look at this gif. Is it weird how quickly the duck calms down the moment Jackie touches it? Wtf?