@Echonic True, her personality seems a bit run-of-the-mill, but from what manga I've read, air-heads like her usually aren't in the main protagonist position that she's in in these sorts of stories. It might also be because we've seen many female characters like her in other series, but not enough of the likes of this guy.
You got an interesting theory with paper bag man, but I don't think her writing ability can make things pop out of the air. At least, it didn't seem like the dude's necktie sword came directly from her power instead of just being tied to it.