anyway for now i'll maintain my theory that if kasumi gets into smash, she'll be the lucina to joker's marth - a stronger base character with longer range and higher damage (sword > knife, rifle > pistol), but with a weaker persona that doesn't power her up nearly as much. essentially, she'd hover closer to a consistent median damage while joker goes from two extremes of wet noodle to steroid ganondorf, making her easier to play but giving joker bigger murder potential if your time with arsene is maximized.
in this event, i'd also guess that her side special is eiga, the medium damage variant on eiha and eigaon, and that, as part of the whole median damage thing, it wouldn't be upgraded with her persona--reason being that after comparing the range on eiha and eigaon, there's a very clear space for a mid-range move, like a sliding scale that's had a piece taken straight out of it:
View attachment 218430
if i really double down on the theory, then i'd also predict that kasumi's persona will have slightly smaller wings than arsene (weaker recovery), and that her rifle special would only launch a burst of two (more powerful) shots, not three