What archetype does Mary Jane Watson fit into? If she does at all?
Manic Pixie girl? not really. Madonna/Whore? maybe not. something different entirely?

She has her own goals, career aspirations (modeling, acting), and character development.

She's not primarily there just to "fix" or change Peter Parker.

She often knows about his Spider-Man identity and actively supports him while maintaining her own agency.

She has storylines that don't necessarily revolve around Peter, even when they were married.

Mary Jane is written as a complex character who doesn't fall into the "pure virgin" or "fallen woman" dichotomy.

She's portrayed as confident, sexually aware, but not defined primarily by her sexuality.

Different writers have portrayed her with varying degrees of both wholesome and sensual qualities without the stark contrast that defines this complex.

supportive partner archetype? - someone who has her own life and personality but chooses to be with the hero despite the complications. She's aware of what she's getting into with Peter's double life and makes that choice consciously.

I love her in Both Ultimate Spider Man runs. and I'll always love her introduction when peter has to leave to stop the Rhino and she jumps on the motorcycle with him. The Glamorous Civilian Adventurous Anchor WHAT A GAL!!!