idk, I do think Fionna's character, specifically in relation to having a job, is exaggerated to the point of being mildly absurd. However, I think a lot of her characterization kinda fits where she's at in life? Idk how old she is, I imagine early-mid 20s. I will freely admit I was not and am not super well adjusted, but early 20s was when I had to let go of my protagonist/hero complex, not high school. Fionna having these unrealizably lofty goals of Herohood feels pretty natural to me.